Finding the best one-piece swimsuits is not as simple as picking the cutest suit on the rack. Fit, support, compression, coverage, and torso length can make the difference between a swimsuit you reach for all summer and one that never leaves the drawer. To help narrow it down, we tested top-rated styles from popular swim brands to find the best one-piece swimsuits for a range of needs, including long torsos, larger busts, tummy control, and everyday comfort.
Our testing focused on the details that matter most in real life: how each suit felt on, how supportive it was in and out of the water, whether the fabric felt compressive or restrictive, and how well the cut worked across different body types. We also considered design features like adjustable straps, bra-style sizing, built-in support, and seat coverage, along with how flattering and wearable each suit felt for swimming, lounging, and travel. That hands-on process helped us separate the truly standout options from the many one-pieces that look good online but disappoint in person.
Whether you want a sleek one-piece for vacations, a supportive swimsuit for a fuller bust, or a classic style that will hold up for years, our guide includes the best one-piece swimsuits we have personally tested and recommend. These picks combine comfort, performance, and style, with options for different budgets and body types. Ahead, shop the one-piece swimsuits that impressed us most.
And for more of our swim coverage, see our articles on the best swimsuits for large busts, the best long torso swimsuits , the best swimsuits for women, and more
Top 3 one-piece swimsuits for women
The Summersalt Sidestroke is one of those rare one-pieces that feels universally flattering, with angled seaming and an asymmetrical neckline that create a sleek, sculpted effect. It is an easy way to get a more fashion-forward look without sacrificing the comfort and ease of a classic one-piece.
With a corseted back that magically snatches your waist, built-in underwire that lifts the breasts, options for short and long torsos, and suits available in your exact cup size up to a J/K, this is one of our top picks for its highly supportive fit.
This sculpting one-piece is made with a silky-soft, quick-drying, highly-compressive material. "I feel like a slippery seal when I wear this," writes senior associate style editor Gabrielle Chase. "It hugs my figure and the fabric feels absolutely yummy."
How we tested the best one-piece swimsuits
We tested brands that can fit differently sized busts . Our editors have cumulatively tested well over two dozen one-piece swimsuits, and we all have different concerns about how they ought to fit. Some of us have narrow rib cages with large busts, which can cause a uniboob situation without the right underwire and separation. Other members of our team have wide rib cages with small busts, which requires underbust seams and padding instead. Wide straps were a common preference for large-busted testers.
We paid attention to the material quality of the fabric. A good one-piece swimsuit should be made with stretchy, quick-drying material that's soft enough to lounge in, yet has enough elastane to retain its shape. We recommend swimsuits that were durable enough to withstand salt water, UV rays, sunscreen, and chlorine, and ran through the washing machine without issue.
We tested brands that accommodate different torso lengths. The length of a one-piece swimsuit can spell the difference between a flattering fit and a camel toe. Long torso swimsuits have more fabric in the midriff so a suits shoulder straps don't dig into your skin. Comfortable seams around the legs and the density of the material around the crotch made it easier to wear these suits for hours at a time.
What we learned while testing one-piece swimsuits
- Don't buy swimsuits from brands that don't specialize in swimsuits. The swim section of your favorite dress brand might look cute, but the suits often lack the technical details that make a one-piece comfortable and long-lasting — like supportive lining, fabric that keeps its shape when wet, and seams that don't dig in. We had the best luck with swim-specific brands that clearly put time and resources into developing their suits.
- If you have a larger bust, look for brands with bra sizing. Alpha sizing (small, medium, large, etc.) won't give you the fit you need. For people with D-cups and up, we recommend looking at our more specialized list of the best swimsuits for people with large busts.
- Adjustability is worth prioritizing. Fixed straps and non-adjustable cuts can work beautifully if the proportions happen to match your body, but adjustable straps, tie backs, removable cups, and flexible necklines make a swimsuit much easier to customize. This is especially helpful for one-pieces, where torso length, bust fit, and bottom coverage must work together.
- A low-back swimsuit is only as good as its front support. Open-back styles look gorgeous, but they often sacrifice structure and turn ill-fitting when wet. The best versions still had enough tension through the front, straps, or waist to keep everything feeling secure.
Best overall: Summersalt Sidestroke
The Summersalt Sidestroke is one of those rare one-pieces that looks good on just about everyone. The angled seaming and asymmetrical neckline create a trendy, sculpted effect, while the clean design keeps it feeling polished and easy to wear. It is an especially good pick if you want a swimsuit that feels a little more elevated than a basic one-piece.
In our guide to the best plus-size swimwear, freelance style reporter and plus-size fashion expert Sarah Chiwaya listed the Summersalt Sidestroke as her favorite one-piece. "Instead of just sticking with one cross strap in the back, this style has two, which distribute bust weight more evenly and don't dig," she writes. "I was happily surprised that this style worked as well as it did on me, as most one-shoulder styles leave me lopsided and uncomfortable."
Insider Reviews executive editor Sally Kaplan also recommends the single-strapped one-piece: "My main consideration when buying a swimsuit is whether or not it has enough support to handle my chest," she writes. "I have a DD cup size, so it can be a pretty significant challenge.In a bold move, I tried the one-shoulder Sidestroke suit in 'White Sand' — which was risky for two obvious reasons. I have to say, I'm incredibly happy with how supportive the suit turned out to be. There was no issue with lopsidedness or sagging, and the diagonal seaming on the front was super flattering. The white color isn't see-through when wet, either," according to Sally.
Best for small busts: Left On Friday Sunday Suit
"I feel as smooth as a seal swimming in the Sunday Suit. It holds me in using a single piece of this silky, almost-seamless Lycra-nylon blend, and while material is thin enough to show some nip, I like how airy and quick-drying it is.
The main drawback our team found is that Left On Friday's swimsuits don't fit true to size (they run small), and the cupless designs don't support large busts very well. However, as someone with a narrow ribcage and 34B cups, I found it hugged me in all the right places.
I'm 5-foot-9 and mostly legs, so I went for the Tall size. I'm relieved I did, because the shoulder straps are short and non-adjustable. If you're anywhere above 5-foot-6, go for the Tall size so it'll stretch to fit your torso. Unfortunately, the XXL size is limited to three colorways, so it's not as inclusive as we'd like.
In the rear, its seat coverage is minimal — not a thong, but it definitely shows cheek — and it stays put so I don't feel like I need to readjust constantly. Down in front, the high-cut legs are comfortable and smooth. No risk of camel toe in the crotch area, either.
The color you choose will have a lot of influence on how the Sunday suit will serve you. I went for a shimmery bronze shade called 'Tan Lines.' It's also my go-to suit for the spa, whether I'm braving the cold plunge or sweating in the sauna." — Gabrielle Chase, senior associate style editor, Insider Reviews
Best for large busts: Bravissimo Cancun One-Piece Swimsuit
For anyone who needs real underboob support, one-piece swimsuits with flimsy padded cups usually do not cut it. Bravissimo's ingenious design gives you the lift of a bra, but it is practically invisible beneath the ribbed texture of the Cancun One-Piece Swimsuit.
You can choose your exact bra size, from 30D to 40J, so the built-in support feels far more precise than what you get with a standard one-piece. Because it is integrated into the suit, you also do not have to worry about it shifting around or slipping out. Best of all, it still looks like a normal swimsuit on the outside, without bulky molded cups that draw extra attention to your chest.
I love this big-boob-friendly swimsuit so much that I would happily buy it in multiple colors, and I have already recommended it to plenty of my friends with larger chests.
Best for a snatched waist: TA3 The Lifty
I love all of my TA3 swimsuits, but the Lifty is my favorite because the underwire is so supportive and prevents the dreaded uniboob that some one-piece bathing suits can cause. The way the sizing works is nothing short of a miracle. You get to choose your bodice length (short or regular/long), your usual swimsuit size (from XS-4X), and your cup size (from A-J/K) to get the absolute perfect fit, plus there are a bunch of color options.
"The thick shoulder straps are comfy and adjustable, and the cups cradle me perfectly with no digging. It even looks super cute as a bodysuit, so you could theoretically wear it with jeans or flowy linen pants and no one would be the wiser. But I know you're all here to find out whether it actually delivers what it promises: a snatched waist. The short answer is: yes! The longer answer is absolutely yes; the lacing in the back actually works like a dream to cinch your waist in. But the good news is that if you're ever feeling bloated or you just want something a little less compressive, you can always just loosen it up. It's like having two sizes in one!
Anyway, if you have a large chest, you won't regret buying this suit — as someone with an F cup, it's definitely the most comfortable and supportive one-piece I've ever tried." — Sally Kaplan, executive editor, Insider Reviews
Read more in our full TA3 swimsuit review.
Best basic: Andie Tulum One-Piece
Simple, comfortable, and reliable – what's not to love? For us, the Andie Tulum One-Piece takes the top spot as the best overall one-piece swimsuit. Up top, it has removable cups a modest scoop neckline. In the seat, there's perfectly balanced medium coverage, so you won't have you keep adjusting as you walk on the shoreline.
Andie gives you options so you can find the perfect fit: find this suit in regular or long torso lengths up to a size 3X. Across the open back are criss-cross straps, which provide a bit of lift and support your bust. The fabric is comfortable enough to nap in, yet it achieves a gentle compressing effect that flatters athletic builds.
Read our full Andie swimwear review to see how its swimsuits fit different body shapes and sizes.
Best trendy: Bydee Amalfi One-Piece
Bydee is an Australian brand with tons of on-trend tropical prints inspired by vacation hotspots. Though I love the patterns, I've avoided their bikinis since the skimpy triangles are far too small for my larger bust. But the Amalfi One-Piece fit perfectly — even if it lacked support.
The stylish swimsuit has a low back, high-cut bottoms, and a flattering V-neck. I appreciate that the straps are adjustable, which helps provide extra room for my chest. And though the high-cut leg is a little more daring than I'm used to, I love how it elongates my legs.
I wore this suit on vacation in Greece, and I can't imagine a better, more on-theme garment for sailing the Aegean.
Best for long torso: Andie Mykonos
We tested different long-torso swimsuits made with extra fabric around the middle. These monokinis are designed for anyone who struggles with perpetual wedgies and too-short shoulder straps. The best of the best turned out to be yet another suit from Andie.
"With a deeply plunging neckline, thick straps, and good bum coverage, this suit has a silhouette that's highly becoming on a variety of body types," writes freelance style reporter Talia Ergas. "The Mykonos suit is my go-to because it's super cute, but it also offers decent coverage to keep me secure during the day's activities."
Best patterned: Boden Rhodes Cup-Size Swimsuit
I was skeptical that a swimsuit sized only by bra measurements could deliver the right fit, but this one proved me wrong. The Boden Rhodes Cup-Size Swimsuit fits perfectly, and the bra-style construction gives it a level of support that feels much more tailored than a standard one-piece.
It comes in three bold, swirling prints that make it feel playful, while the balconette neckline and underwire add lift and structure similar to a bra. The straps are removable, which is especially nice for sunbathing when you want to avoid extra tan lines, and the fully lined torso helps the suit feel secure and substantial.
There is also tummy paneling through the midsection, which gives it a more sculpted, structured look without making it feel overly stiff.
Most stylish: Cin Cin Scorpio
Cin Cin has quickly become a go-to brand for influencers, the fashion crowd, and everyone in the know. They all feature Pucci-esque patterns that give the suits a glamorous '60s resortwear feel. The gold buckle at the waist adds just enough polish, and I love that it could easily double as a bodysuit with linen pants or a breezy skirt after the beach.
I've gotten tons of compliments on this suit — especially when paired with the matching robe. The full outfit gives Côte d'Azur in the summertime — bougie, stylish, and glamourously vintage.
At $250, it's a splurge, but a standout pick for anyone who wants a one-piece that can double as a bodysuit under linen pants or a skirt.
Best wrap: Summersalt The Perfect Wrap One-Piece
We've spotted this iconic one-piece on many a beachgoer over the years, and it's easy to see why. The wrap style is universally flattering, comfortable, and the compressive fabric keeps everything in place. Though the deep-V neckline doesn't provide much lift for large busts, the cups are padded so you can enjoy the beach without having a fashion emergency.
"I loved wearing the Perfect Wrap One-Piece to the beach because I didn't need an extra top for exploring the boardwalk or going into a restaurant. I wore it with a skirt and it looked like a regular top," writes former culture & employee experience manager MoMo Lamping. "It wins in the tummy support department, too. The wrap detail adds fun while accentuating my waist to create an hourglass shape."
Read our full Summersalt swimwear review to see our favorite pieces.
Best stretch: Youswim Eva One-Piece
"The thing I love so much about the crinkle style is that the material is silky and weighty, but it's not compressive at all (unlike the TA3 shaping swimsuit, which I also love but for very different reasons)" writes Sally Kaplan, executive editor of Insider Reviews.
"Even once it's wet, the way the material clings to the body doesn't make me feel too exposed, plus it has a normal-cut leg for a solid amount of coverage," she continues. "And I know that because it's super stretchy, it's going to fit me through the very real weight and size fluctuations I experience at the whims of my cycle."
Best scoop neck: Dos Gardenias Sophia One-Piece
If you're looking for a basic one-piece that is still distinctive, the Sophia from Dos Gardenias is a great option. The scoop neck gives the swimsuit a vintage flair, which pairs perfectly with fun accessories like cat-eye sunglasses or a silk head scarf.
The suit itself is meant to be tight and supportive, and it fits great. But just be warned that it won't work for people with long torsos. I am petite with a larger bust, and I felt like I was pushing the vertical stretch.
But by far my favorite part about this swimsuit is that it looks like a cute top. I love wearing it with a long linen skirt (like above), and on days when I know I'll be going from the beach to lunch or shopping.
Most supportive: Helen Jon Olivia One-Piece
"Helen Jon actually measures the fit of its suits on its own employees. The company clearly understands how using fit models exclusively may not always be the best approach. So, they came up with a different one, and it seems to really work," writes executive editor Sally Kaplan. Each piece is fit on at least seven different bodies of different ages, weights, and heights to ensure it fits a myriad of body types, and fits them well.
The Olivia suit is fully lined and reinforced with an underbust seam. It also features a v-neck and shirring detail around the torso for a super flattering fit. While there are a few suits with underbust seams on this list, Helen Jon offers the most supportive fit for most body types and different-sized busts.
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Disclosure: Written and researched by the Insider Reviews team. We highlight products and services you might find interesting. If you buy them, we may get a small share of the revenue from the sale from our partners. We may receive products free of charge from manufacturers to test. This does not drive our decision as to whether or not a product is featured or recommended. We operate independently from our advertising team. We welcome your feedback. Email us at reviews@bjinnox.com.
