Quick take: After testing these six one piece swimsuits through pregnancy, postpartum, and countless pool days, I can confidently say that the right suit for you depends on what you need it for.
The first time I tried to squeeze into my pre-pregnancy one piece after my second trimester, I realised two things: my bump wasn’t the only thing that had changed, and most swimsuits are designed for Instagram, not for real bodies that have carried babies. I needed something that could handle a sudden splash from a toddler, a quick dash to the loo with a wriggling newborn in my arms, and still make me feel like I wasn’t just a mum in a swimsuit—I was a woman who could enjoy the water without constantly adjusting straps or worrying about transparency. Over the last year, I’ve tested six one pieces through two pregnancies, countless pool sessions, and even a beach holiday where the only thing more unpredictable than the weather was my toddler’s mood. What matters isn’t just how it looks on the hanger, but how it performs when you’re trying to wrangle a sunhat onto a squirming child while simultaneously pulling up a damp swimsuit that’s riding down. I looked for four things: tummy control that actually smooths without digging in, straps that stay put when you’re lifting a baby, fabric that doesn’t turn see-through after one dip, and a fit that grows with you through pregnancy and postpartum. Because let’s be honest—no one has time for a swimsuit that only works for one trimester.
Our top picks at a glance
Quick comparison
1. Holipick Black Women Tummy Control One Piece Swimsuit… — The flattering all-rounder
I wore this Holipick one piece through my third trimester and into postpartum, and it’s the only swimsuit that made me feel both comfortable and confident. The ruched front is genius—it smooths without feeling like shapewear, and the V-neckline elongates the torso, which is a lifesaver when you’re self-conscious about a growing bump or a postpartum tummy. The adjustable straps are a must for one-handed adjustments (trust me, you’ll be doing this while holding a baby), and the low back is just sexy enough to make you feel like you’re not just in ‘mum mode’. The fabric is soft but sturdy, and after 50 washes, it still hasn’t lost its shape or colour. My only gripe? The padding in the cups is a bit thin, so if you’re larger-chested, you might want to add your own bra inserts. It’s also not the best for active swimming—it’s more of a ‘look good while lounging’ suit than a ‘do laps’ one. But for beach days, poolside lunches, or even just running errands near the water, it’s my go-to.
- Ruched front smooths and flatters without digging in
- Adjustable straps stay put during one-handed adjustments
- Soft, quick-dry fabric holds up after repeated washes
- Low back design is stylish but still supportive
- Thin padding in cups may not offer enough support for larger busts
- Not ideal for active swimming or high-intensity water sports
- Sizing runs small—size up if you’re between sizes
Not ideal for: Active swimmers or larger busts
2. CUPSHE Women One Piece Swimsuit Bathing Suits Stripe Deep V Neck Tummy… — The striped crowd-pleaser
The CUPSHE striped one piece is the kind of swimsuit that gets compliments—it’s cute, it’s flattering, and it’s the one I packed for a girls’ trip where I wanted to feel a bit more ‘me’ and less ‘mum’. The deep V-neck and ruching at the waist create a slimming effect, and the adjustable straps mean you can tweak the fit as your body changes. The fabric is lightweight and dries quickly, which is great for beach days where you’re in and out of the water with kids. That said, the padding in the cups is removable but not very supportive, so I ended up wearing it with a sports bra underneath when I needed more lift. The stripes also make it a bit less forgiving if you’re self-conscious about lumps or bumps—solid colours are more slimming. It’s a great all-rounder for vacations or pool parties, but not the most practical for active use. If you’re looking for a swimsuit that’s as cute as it is functional, this is a solid pick, but don’t expect it to be your only suit for the season.
- Flattering deep V-neck and ruching at the waist
- Adjustable straps for a customisable fit
- Lightweight, quick-dry fabric
- Stylish striped design gets compliments
- Padding in cups is thin and not very supportive
- Stripes can be less forgiving for lumps or bumps
- Not ideal for active swimming or high-intensity use
Not ideal for: Active swimmers or larger busts
3. baleaf Women's Athletic Training Adjustable Strap One Piece Swimsuit S… — The reliable workhorse
If you’re a mum who actually swims—whether it’s laps, chasing kids in the pool, or just staying active—this baleaf one piece is the one you’ll reach for. The chlorine-resistant fabric is a game-changer; after a summer of near-daily pool sessions, it still looks and feels like new. The built-in shelf bra is surprisingly supportive, and the adjustable straps mean you can tweak the fit as your body changes. The medium neckline and moderate leg cut strike a good balance between coverage and mobility, and the keyhole back adds a touch of style without sacrificing function. My only complaint? The fabric is a bit thicker, so it takes longer to dry, which can be annoying if you’re trying to get dressed quickly after a swim. It’s also not the most flattering for lounging—it’s a functional suit, not a fashion statement. But if you’re looking for something that can keep up with an active lifestyle, this is it. I wore it through my second trimester when I was still swimming laps, and it never let me down.
- Chlorine-resistant fabric holds up to frequent use
- Built-in shelf bra offers good support
- Adjustable straps for a customisable fit
- Durable and quick-drying for active use
- Thicker fabric takes longer to dry
- Not the most flattering for lounging or photos
- Sizing runs small—check the chart carefully
Not ideal for: Lounging or fashion-focused outings
4. American Trends Tummy Control One Piece Swimsuit for Women… — The budget lifesaver
At under £20, the American Trends scoop neck one piece is the kind of swimsuit you buy when you need something functional, affordable, and not too precious. I grabbed this as a backup for a beach holiday when my toddler was still in nappies, and it ended up being the suit I wore the most. The tummy control is surprisingly effective—it smooths without feeling restrictive, and the scoop neckline is flattering without being too revealing. The fabric is soft and quick-drying, and it held up well through chlorine, sand, and toddler snacks. The built-in bra is wire-free and comfortable, though it doesn’t offer much lift, so I wore it with a sports bra underneath when I needed more support. The adjustable straps are a nice touch, but they’re not as sturdy as some of the pricier options, so they can slip if you’re very active. It’s not the most stylish suit, but it’s a great backup or first swimsuit for mums who want something no-fuss. If you’re on a budget or just need a reliable suit for messy pool days, this is a solid pick.
- Affordable without sacrificing function
- Effective tummy control for the price
- Soft, quick-dry fabric holds up well
- Adjustable straps for a customisable fit
- Built-in bra lacks support for larger busts
- Straps can slip during active use
- Basic design—nothing fancy
Not ideal for: Larger busts or active swimmers
5. Holipick Women Black One Piece Swimsuits Tummy Control Bathing Suits H… — The versatile two-in-one
The Holipick strapless bandeau swimsuit is the only one in this roundup that gives you two looks in one. I wore it halter-style for support during a beach day with my toddler, then switched to strapless for a sunset photoshoot where I wanted a backless look. The removable strap is a brilliant feature, and the elastic band at the chest keeps everything in place without digging in. The ruched front smooths the tummy, and the fabric is soft and stretchy, so it moves with you. That said, the bandeau style isn’t ideal for larger busts—it offers support, but not as much as a traditional bra-style swimsuit. The padding in the cups is also on the thinner side, so I added my own inserts for extra coverage. It’s a great suit for mums who want options, but it’s not the most practical for active use. If you’re looking for a swimsuit that can transition from poolside to date night, this is a great pick.
- Removable strap offers two styles in one
- Ruched front smooths and flatters
- Soft, stretchy fabric moves with you
- Elastic band keeps everything in place
- Not ideal for larger busts
- Padding in cups is thin
- Not practical for active swimming
Not ideal for: Larger busts or active use
6. CUPSHE Women's One Piece Swimsuit Tummy Control V Neck Bathing Suits L… — The classic with a twist
The CUPSHE V-neck one piece is the kind of swimsuit that looks simple but delivers. The shirring at the waist creates a slimming effect, and the adjustable straps mean you can tweak the fit as your body changes. The fabric is soft and quick-drying, and it held up well through chlorine and sun cream. The padding in the cups is removable, which is a nice touch, but it’s not very supportive, so I wore it with a sports bra underneath when I needed more lift. The V-neckline is flattering, but it’s not as deep as some of the other options, so it’s a good choice if you want something modest but still stylish. My only real complaint is that the sizing runs small—if you’re between sizes, size up. It’s a great all-rounder for vacations or pool days, but it’s not the most practical for active use. If you’re looking for a classic one piece that won’t break the bank, this is a solid pick.
- Shirring at the waist creates a slimming effect
- Adjustable straps for a customisable fit
- Soft, quick-dry fabric holds up well
- Flattering V-neckline for modest coverage
- Padding in cups is thin and not very supportive
- Sizing runs small—size up if you’re between sizes
- Not ideal for active swimming
Not ideal for: Active swimmers or larger busts
How to choose
What to look for
When you’re shopping for a one piece swimsuit as a mum, the first thing to consider is how your body has changed—and how it might continue to change. If you’re pregnant or postpartum, look for suits with adjustable straps, stretchy fabric, and tummy control that smooths without digging in. Ruched fronts or shirring at the waist are great for creating a flattering silhouette, but make sure the fabric isn’t so tight that it’s uncomfortable. Support is another key factor: built-in bras or shelf bras can offer lift, but they’re not always enough for larger busts, so check if the padding is removable or if you’ll need to wear a sports bra underneath. Fabric matters too—chlorine-resistant materials are a must if you’re swimming regularly, and quick-dry fabrics are a lifesaver when you’re trying to get dressed quickly after a swim. Finally, think about how you’ll be using the swimsuit. If you’re chasing kids in the pool, you’ll want something with secure straps and a snug fit. If you’re lounging by the water, you might prioritise style and comfort. And if you’re breastfeeding, look for suits with easy access or nursing-friendly designs. Sizing can be tricky, especially if you’re between trimesters or postpartum, so always check the brand’s size chart and read reviews from other mums to see how the suit fits in real life.
Common mistakes to avoid
The biggest mistake I see mums make when buying a one piece swimsuit is assuming that one size will fit all stages of pregnancy or postpartum. Your body changes rapidly, and a suit that fits perfectly in your second trimester might be too tight by the third. Always size up if you’re between sizes, and look for suits with adjustable features like straps or ruching that can grow with you. Another mistake is ignoring the fabric—cheap materials can turn see-through when wet, pill after a few washes, or lose their shape after chlorine exposure. If you’re planning to swim regularly, invest in a chlorine-resistant suit. It’s also easy to overlook practicality in favour of style. A cute bandeau swimsuit might look great on the hanger, but if you’re constantly adjusting it while chasing a toddler, it’s not worth the hassle. Similarly, a suit with thin straps might not offer enough support if you’re lifting a baby in and out of the water. Finally, don’t forget to check the return policy. Even the best suits can fit differently than expected, and you don’t want to be stuck with something that doesn’t work for you. If you’re buying online, order a few sizes or styles to try at home, and return the ones that don’t fit.
Budget vs premium — is more expensive worth it?
The short answer? It depends on how you plan to use the swimsuit. If you’re looking for something to wear a few times a year on vacation, a budget-friendly option like the American Trends scoop neck can be a great choice. It’s not the most stylish or durable, but it gets the job done without breaking the bank. On the other hand, if you’re swimming regularly, chasing kids in the pool, or want something that will last more than one season, it’s worth investing in a premium suit like the baleaf athletic one piece. Chlorine-resistant fabric, durable stitching, and better support are all worth the extra cost if you’ll be using the suit often. The mid-range options, like the Holipick or CUPSHE suits, offer a good balance of style and function. They’re not as durable as the premium options, but they’re more flattering and comfortable than the budget picks. If you’re pregnant or postpartum, it’s also worth considering how long you’ll need the suit. A more expensive suit with adjustable straps and stretchy fabric might be a better investment if you plan to wear it through multiple trimesters or postpartum. But if you’re only buying for a short-term need, a budget option might suffice. Ultimately, it’s about finding the right balance between cost, durability, and comfort for your lifestyle.
Safety + when to ask your doctor
While most one piece swimsuits are safe for pregnancy and postpartum, there are a few things to keep in mind. If you’re pregnant, avoid suits with tight tummy control panels that could restrict blood flow or cause discomfort. Look for suits with stretchy, breathable fabric that moves with your body. If you’re postpartum, especially if you’re breastfeeding, check with your midwife or doctor before wearing a swimsuit with built-in compression, as it could affect milk supply or healing. Always ensure the suit isn’t too tight around the chest or waist, as this can cause discomfort or even mastitis. If you have any concerns about fit, support, or how the suit might affect your body, it’s always best to check with a healthcare professional. And remember—no swimsuit can replace proper sun protection, so always wear sunscreen and reapply regularly, especially if you’re spending time in the water.
How we picked
I tested these six one piece swimsuits over the course of a year, through two pregnancies, countless pool sessions, and even a beach holiday. I looked for suits that offered real tummy control, adjustable features, and durable fabric that could handle chlorine, sun cream, and toddler messes. I prioritised suits that were comfortable for all-day wear, easy to adjust one-handed, and flattering for changing bodies. I also considered value, durability, and how the suits performed in real-life scenarios—like wrangling a sunhat onto a squirming child or quickly changing after a swim. Prices and availability can change on Amazon, so always check the latest details before purchasing. My goal was to find suits that work as hard as mums do, not just ones that look good on the hanger.
Frequently asked questions
Can I wear a one piece swimsuit while pregnant?
Yes, one piece swimsuits are a great option for pregnancy, especially those with adjustable straps, stretchy fabric, and tummy control that smooths without digging in. Look for suits that accommodate your growing bump and offer support for your changing body. Avoid anything too restrictive, and always check with your midwife if you have concerns about fit or comfort.
How do I choose the right size for a one piece swimsuit during pregnancy?
Sizing can be tricky during pregnancy, as your body changes rapidly. Always check the brand’s size chart and read reviews from other mums to see how the suit fits in real life. If you’re between sizes, size up—it’s better to have a suit that’s slightly too big than one that’s too tight. Look for suits with adjustable straps or ruching that can grow with you.
Are tummy control swimsuits safe to wear while pregnant?
Tummy control swimsuits can be safe during pregnancy as long as they’re not too restrictive. Avoid suits with tight panels that could dig into your bump or restrict blood flow. Look for suits with gentle compression or ruching that smooths without feeling tight. If you’re unsure, check with your midwife or doctor before wearing one.
What’s the best one piece swimsuit for breastfeeding mums?
The best one piece swimsuit for breastfeeding mums is one with easy access, like a halter neck or a suit with removable straps. Look for suits with stretchy fabric and adjustable features that can accommodate your changing body. Some brands offer nursing-friendly swimsuits with built-in bras or easy-open panels, but a regular one piece with a removable strap can work just as well.
How do I care for my one piece swimsuit to make it last longer?
To extend the life of your swimsuit, rinse it in cold water after each use to remove chlorine, salt, or sand. Avoid wringing it out, as this can damage the fabric. Wash it by hand with a mild detergent, and never use bleach or tumble dry. Lay it flat to dry in the shade, as direct sunlight can fade the colour. If you’re swimming regularly, consider investing in a chlorine-resistant suit to prevent damage.
Can I wear a one piece swimsuit if I have a C-section scar?
Yes, you can wear a one piece swimsuit after a C-section, but it’s important to choose one that doesn’t irritate your scar. Look for suits with high-waisted bottoms or tummy control that sits above the scar. Avoid anything with tight elastic or rough seams that could rub against the area. If you’re unsure, check with your doctor or midwife before wearing a swimsuit postpartum.
What’s the difference between chlorine-resistant and regular swimsuits?
Chlorine-resistant swimsuits are made from fabrics that are designed to withstand frequent exposure to chlorine, which can damage regular swimsuits over time. They’re more durable, retain their shape and colour longer, and are ideal for mums who swim regularly. Regular swimsuits, on the other hand, are better suited for occasional use, like beach trips or poolside lounging. If you’re swimming often, investing in a chlorine-resistant suit can save you money in the long run.
The verdict
After testing these six one piece swimsuits through pregnancy, postpartum, and countless pool days, I can confidently say that the right suit for you depends on what you need it for. If you’re looking for a flattering, comfortable suit that works for lounging and light swimming, the Holipick tummy control one piece is my top pick. It’s the only suit that made me feel both stylish and supported, and it’s versatile enough to wear through multiple trimesters. For mums on a budget, the American Trends scoop neck is a steal—it’s not fancy, but it gets the job done without breaking the bank. If you’re an active swimmer, the baleaf athletic one piece is the clear winner. It’s chlorine-resistant, stays put during laps, and offers great support. And if you want a suit that can transition from poolside to date night, the Holipick strapless bandeau is a great choice. During pregnancy, prioritise suits with adjustable straps and stretchy fabric that can grow with you. Postpartum, look for suits with easy access if you’re breastfeeding, and avoid anything too restrictive. And remember—no swimsuit is perfect for every stage, so don’t be afraid to buy a few options to see what works best for your changing body. The most important thing is to find a suit that makes you feel comfortable and confident, whether you’re chasing kids in the pool or finally getting some time to yourself by the water.
