How many weeks into your pregnancy are you before that pre-bump swimsuit starts digging into your shoulders or feeling dangerously tight across the hips? For me, the breaking point came at week twenty-two during a local pool visit. I realized that my favorite high-stretch bikini wasn’t providing the support my lower back needed, and the fabric was stretched so thin it was practically sheer. Transitioning to a dedicated maternity one-piece isn’t just a matter of aesthetics; it is about finding a garment engineered for a body that changes its dimensions every single week. After testing several brands across two pregnancies, I have learned that the best one piece swimsuit for pregnancy must balance belly room with bust support and fabric longevity.
What features should you prioritize in a maternity one-piece swimsuit?
When you are shopping for a maternity suit, the first thing you will notice is the ruching. Side ruching is the gathered fabric along the seams of the stomach area. This is not just a stylistic choice. It allows the suit to expand vertically and horizontally without putting pressure on your midsection. In my experience, suits without ruching often end up feeling too short in the torso by the third trimester. This leads to the straps pulling down painfully on your shoulders. You want a suit that grows with you, rather than one you have to squeeze into. Look for nylon-spandex blends with at least 15% spandex for maximum elasticity.
Bust support is the second non-negotiable factor. Pregnancy often brings a significant increase in cup size, and standard swimsuits rarely have the internal structure to handle that weight. I always look for a wide under-bust elastic band or a built-in shelf bra. Removable pads are a personal preference, but they can help with the increased nipple sensitivity that many of us face. If you are planning on doing actual laps, a racerback design will distribute the weight of your chest across your back more evenly than traditional spaghetti straps or a halter neck. Halters, while cute, often cause neck strain after thirty minutes in the water.
Lastly, consider the lining. A fully lined suit provides a layer of compression that feels incredibly secure when your skin is feeling tight and itchy from stretching. It also ensures that the suit remains opaque. There is nothing quite as frustrating as buying a beautiful light-colored maternity suit only to realize it becomes see-through the moment it hits the water. High-quality brands like Summersalt or Hatch use double-layered fabric for this exact reason. It feels more like a hug and less like a thin layer of plastic.
Best maternity one-piece swimsuits for pool laps and active swimming
If you are someone who uses swimming as your primary form of prenatal exercise, you need a suit that stays put. There is nothing worse than having to adjust your leg openings or pull up your neckline every time you push off the wall. For active sessions, the Nike Maternity One Piece is a standout. It usually retails for around $60.00 and features a high neckline and a U-back design that offers a lot of security. The fabric is chlorine-resistant, which is a big deal if you are hitting the YMCA pool three times a week. Cheap suits will lose their elasticity within two months of heavy chlorine exposure, but this one holds its shape well into the postpartum period.
Nike Maternity One Piece Specs
- Approximate Price: $60.00
- Pros: Excellent chlorine resistance, secure fit for lap swimming, modest coverage.
- Cons: The leg opening is cut somewhat low, which can feel restrictive for some.
Another excellent option for the active mother is the Gap Maternity Recycled V-Neck Swimsuit. Priced between $40.00 and $70.00 depending on sales, it offers a surprisingly robust shelf bra. I found that the V-neck is deep enough to be flattering but high enough that I didn’t feel like I was spilling out during a vigorous breaststroke. The recycled polyester blend is a bit stiffer than the Nike suit, which provides a nice sense of support for the bump. However, because the fabric is stiffer, I recommend sizing up if you are between sizes or have a particularly long torso. And remember, the goal here is movement without distraction.
Top-rated stylish one-piece swimsuits for beach vacations and lounging
Sometimes you aren’t at the pool to do laps; you are there to feel human again while on a babymoon. For style and pure comfort, The Shoreline Swimsuit by Hatch is the gold standard, though it comes with a premium price tag of approximately $150.00. The fabric is incredibly soft—almost like a second skin. It features a chic tie-shoulder design that allows you to adjust the torso length perfectly. This was a lifesaver for me because my torso is naturally long, and pregnancy only made the fit of standard suits more difficult. The ruching on the Hatch suit is subtle but incredibly effective, accommodating a nine-month belly without looking like a crumpled bag.
Hatch The Shoreline Swimsuit Specs
- Approximate Price: $150.00
- Pros: Highly adjustable straps, premium soft-touch fabric, very stylish aesthetic.
- Cons: High price point, not ideal for high-impact swimming due to tie-straps.
If you want that high-end look without the $150 price tag, Summersalt’s The Maternity Marina is a fantastic middle ground at about $95.00. Summersalt is known for their “Data-Fit,” and their maternity line is no exception. The Marina features color-blocking that is strategically placed to flatter the changing silhouette. The compression fabric is the real star here. It’s made from 78% recycled polyamide, and it feels much more substantial than your average department store suit. It doesn’t have traditional ruching; instead, it relies on the extreme 4-way stretch of the fabric. I found this worked perfectly up until about week thirty-four, though very large bumps might prefer a suit with dedicated side gathers.
How to choose the right size maternity swimsuit for different trimesters
The most common advice you will hear is to “buy your pre-pregnancy size.” I have found this to be a half-truth. While the brands design the suits to accommodate a growing belly, they don’t always account for the fact that your ribcage actually expands and your hips may widen. If you were a tight size 6 before pregnancy, a maternity size 6 might feel restrictive by the third trimester. I always suggest taking your current measurements—specifically your bust and your “torso girth” (the loop from your shoulder, through your legs, and back to the shoulder). If your torso measurement has increased by more than two inches, size up.
A quick tip for the third trimester: If you find that the leg openings are digging in, look for a suit with a “high-cut” leg. It sounds counterintuitive for modesty, but a higher cut actually provides more room for your thighs and hips to move without the elastic binding against your skin.
During the first trimester, you can often get away with your regular suits, but the second trimester is when the transition usually happens. This is when the “bump” starts to push the fabric forward, which pulls the neckline down. If you are buying a suit in your second trimester, make sure there is still “excess” fabric in the ruched areas. If the ruching is already fully stretched out at twenty weeks, that suit will not make it to forty weeks. You want to see those little folds of fabric on the sides; that is your growth insurance. But don’t go too big; a suit that is baggy in the crotch or the bottom will only become more cumbersome when it gets heavy with water.
Comparing the best maternity one-piece swimsuits of 2024 by price and support
Choosing the right suit often comes down to your budget and how often you plan to be in the water. I have put together a comparison of the top contenders based on my own testing and the technical specifications provided by the manufacturers. If you are only going to the beach once, a budget option is fine. But if you are using the water to relieve pelvic pressure daily, investing in a suit with higher spandex content and better bust support is worth every penny.
| Brand & Model | Price (Approx) | Primary Material | Best For | Support Level |
|---|---|---|---|---|
| Nike Maternity One Piece | $60.00 | Polyester/Spandex | Lap Swimming | High |
| Hatch The Shoreline | $150.00 | Nylon/Spandex | Style & Comfort | Medium |
| Summersalt The Marina | $95.00 | Recycled Polyamide | Compression | High |
| Gap Maternity Recycled | $55.00 | Recycled Polyester | Budget/Daily Use | Medium |
| YouSwim Aplomb (One Size) | $139.00 | Nylon/Elastane | Longevity/Postpartum | Medium-High |
One brand I didn’t mention earlier but included in the table is YouSwim. Their Aplomb suit is unique because it is “one size fits all” (specifically fitting US sizes 2 through 14). It uses a ribbed, crinkle-stretch fabric that is incredibly forgiving. I wore this through my entire second pregnancy and well into the postpartum period. Because it doesn’t have specific “maternity” tailoring like ruching, it looks like a normal suit when you aren’t pregnant, but it stretches effortlessly over a full-term bump. It is an expensive upfront cost, but the cost-per-wear is lower than buying a maternity suit you only use for four months and then discard. The texture also hides any lumps or bumps you might be feeling self-conscious about, which is a nice bonus when you’re feeling particularly swollen.
When you finally get into the water, that feeling of weightlessness is the best reward. Whether you choose the technical precision of the Nike suit or the luxury feel of the Hatch Shoreline, the key is to ensure you aren’t fighting your swimwear. A good one-piece should be the last thing on your mind while you’re floating. Take your measurements, check the lining, and don’t be afraid to size up for the sake of your comfort. You are growing a human; your swimsuit should be working just as hard as you are.