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Our editors have lived in sustainable fashion for over a decade — these are our favorite one-pieces that are comfortable, size-inclusive, and good for you and the earth.
If you prefer a one-piece swimsuit to a two-piece, you’re in luck — the swimwear market has so many comfortable, flattering one-pieces with as much (or as little) coverage as you’d like. You just have to know where to find them.
So we’ve rounded up some of our favorite one-piece swimsuits below, all of which are from brands that prioritize sustainability.
Shopping for a sustainable swimsuit can be difficult. Because they need to be stretchy, compressive, and quick-drying, bathing suits can’t really be made of natural materials like cotton or linen. They’ve got to be synthetic.
Why consider sustainable swimwear?
That’s why we always look for recycled synthetic materials when shopping for swimwear. Thankfully, these days there are plenty of fantastic brands making swimwear out of recycled nylon or polyester fabrics, so we can reduce our consumption footprint by wearing swimwear made of repurposed, rather than virgin, material.
Some of the brands below use recycled fibers from old synthetic materials, and others have a more direct hand in taking waste like plastic water bottles and nylon fishing nets and turning them into swimwear. Others focus on crafting with high-quality fabric that’s resistant to pilling, fading, and snagging — because whenever we do purchase synthetic materials, we want to be certain we’ll use the garment for years and years to come.
Our criteria:
Our team has worn and researched dozens of sustainable brands, and scoured thousands of online reviews to select our top picks for thoughtfully made swimwear. We regularly update this list with new favorites that meet the below criteria:
- SUSTAINABLE | Each of these swimwear brands prioritizes sustainable fabrics in their swimwear, including recycled and plant-based materials.
- SIZE INCLUSIVE | We’ve included a variety of sustainable swimwear brands offering a wide range of sizes, ranging from XXS–6X.
- AFFORDABLE | Sustainable clothing can get expensive! That’s why we’ve done the research and have made sure to include our favorite eco-friendly lines that offer high-quality and sustainable swimwear at affordable prices.
- ETHICS | These swimwear brands produce their one-pieces using ethical, fair, and safe manufacturing practices, with many pieces made in the USA.
For more warm weather staples, take a look at our favorite natural sunscreens, sustainable sunnies, and sustainable sandals, too!
1. Summersalt
Best For | Color-blocked swimsuits
Sustainable materials | Fabric made of 78% recycled polyamide
Prices starting at | $95
Summersalt specializes in swimwear for “life beyond the lounge chair,” creating wearable, high-quality styles that are super comfy to move around in. Besides working with responsible manufacturing partners to make sure they’re crafting swimwear that’ll last you for years, Summersalt also uses a 78% recycled polyamide fabric in all of its swimwear. Some of their adorably timeless one-piece styles include their ruffle oasis style with a square neckline, ruffled straps, and built-in soft cups. We also love their best-selling sidestroke suit, which has a one-shoulder design, an open back, and comes in plenty of different color block patterns. Some of their suits have long torso options, and their sizing goes up to size 24.
Customer Review | “Very comfortable swimsuit. The colors are bright, the material is perfect to swim or lounge in. I would buy another. Love it!” – Michelle (Read more reviews.)
2. Patagonia
Best For | Fair Trade swimsuits
Sustainable materials | Recycled polyester, recycled nylon
Prices starting at | $139
Not only will you find a handful of different one-piece suits at Patagonia, like the simple sunny tide one-piece suit or the reversible extended break one-piece with a sexy open back and V-neck — but you’ll also find plenty of board shorts and rash guards, too, for comfortable coverage especially when you’re staying active. All of Patagonia’s swimwear is designed to be comfy and timeless, and is made in Fair Trade factories using recycled nylon and recycled polyester. And Patagonia is one of the most sustainable companies out there — they’re a B Corp and a member of 1% for the Planet to boot.
Customer Review | “I think Patagonia finally nailed it for a one-piece swimsuit. The cut is flattering but cheeky and the material is super silky and fast drying. No, there aren’t any cups or adjustable straps but that isn’t a deal breaker for me.” – Melissa (Read more reviews.)
3. Youswim
Best For | Inclusive sizing
Sustainable materials | Responsible dying practices, European-sourced nylon
Prices starting at | $159
Youswim only makes swimsuits in two sizes — that’s right, just two — but they’re still one of the most size-inclusive brands on this list. That’s because their two sizes are made of a super stretchy Versoform™ crinkle fabric that accommodates a dozen traditional sizes each. “Stretch I” accommodates sizes 2 through 12, and “Stretch II” fits sizes 14 through 24, meaning the suits are designed to last you summer after summer, whether or not your body changes. They make three simple one-piece suits — the aplomb suit with a square neckline, the poise suit with adjustable spaghetti straps, and the Eva suit with a V-neck, supportive straps, and a scoop back. All the one-pieces have medium coverage on the bottom and come in a handful of neutral and neutral-adjacent colors. And they’re all made in the UK of European-sourced premium nylon and dyed at responsible UK facilities.
Customer Review | “Definitely worth the hype and the price. Fits incredibly well and comfortably. Doesn’t cut in anywhere and feels super lightweight on the body. Great coverage on the bum, didn’t have to readjust once!! I have always struggled to find one-pieces that fit me in length as I’m fairly tall, and this one is amazing 🤩. 100% recommend this brand, I will be buying more.” – Emma W. (Read more reviews.)
4. TomboyX
Best For | Gender-neutral swimwear
Sustainable materials | 80% recycled polyester, 20% spandex OEKO-Tex certified fabric
Prices starting at | $89
TomboyX is a one-stop shop for gender-neutral and gender-fluid swimwear. And while they make full-coverage two-pieces like board shorts and tanks, they have plenty of one-pieces and unisuits, too. Their unisuits come in short-sleeve, tank top, or spaghetti strap options, all with shorts lengths of 3.5 to 6 inches. And their one-pieces include a tucking one-piece and some reversible one-pieces, whether you want a sleek black look or a colorful vibe. All the fabric they use has UV 50 UPF sun protection and is made with an OEKO-Tex certified fabric made of primarily recycled materials. The certified B Corp was founded over 10 years ago with the mission of creating underwear that “anybody could feel comfortable in, inclusive of all sizes and gender expressions.”
Customer Review | “I can’t understate how much these suits have improved my quality of life. I went from being an enthusiastic swimmer as a kid and a lifeguard as a teen to abandoning swimming entirely for over 15 years due to dysmorphia. As soon as I got this suit on, I jumped back into the water and have recently joined a swimming team again!” – Nikouro (Read more reviews.)
5. Londre
Best For | Sexy one-pieces
Sustainable materials | OEKO-Tex certified fabric made of recycled water bottles
Prices starting at | $159
Pegging itself as a “bodywear” brand, Londre makes all of its swimsuits in British Columbia out of fabric made from recycled plastic, and their textile factory is OEKO-Tex certified. They have both a repair and a recycling program, meaning you’ll be compensated for repairs needed on your suit in the first year of owning it, and your suit can be recycled into new materials at the end of its life. Their one-pieces range from sexy options with plunging necks and backs like the multiway to more full-coverage options like the supportive square-neck one-piece. And their suits are made of their “signature comfort compression” fabric that comes from recycled water bottles.
Customer Review | “I am OBSESSED with this suit, the material is so comfortable and the suit is classy yet very sexy, I’ll definitely be ordering another in the fiesta red!!!” – Paula O. (Read more reviews.)
6. Vitamin A
Best For | Designer-quality swimwear
Sustainable materials | Fabric made of recycled nylon
Prices starting at | $165
Vitamin A doesn’t compromise on either style or sustainability, crafting all of its designer-quality swimwear in California. Before designer Amahlia Stevens launched Vitamin A, she helped develop EcoLux™, the first premium swim fabric made from recycled nylon fibers. Today, the brand incorporates other sustainable fabrics like Tencel, all of which are OEKO-Tex certified. They make a wide range of one-pieces — some are simple and elegant, like the Jenna high leg one-piece, while others have fun, sexy silhouettes with cutouts like the Cosmo one shoulder one-piece, and others still come in vibrant colors and patterns like the Gemma one-piece.
Customer Review | “The PERFECT one-piece! This EcoLux fabric is so buttery smooth on the skin. The square neckline is super flattering and the back of the bottoms aren’t too revealing. You can adjust the cheekiness of this suit – which I appreciate! And the Mocha color is gorgeous!!” – Lexy (Read more reviews.)
7. Berlook
Best For | Affordable one-pieces
Sustainable materials | ECONYL, made of repurposed nylon
Prices starting at | $48
Berlook’s swimsuits are made of materials like ECONYL, A.K.A. recycled polyamide, certified recycled by the Global Recycled Standard. They’re also the most affordable brand on this list, with many of their price tags for one-pieces hovering around $50. And they make so many different styles, whether you’re looking for something eye-catching and sexy like the textured plunge one-piece with a plunging V-neck, or something more classic like the textured backless one-piece with a square neck and spaghetti straps, or this adorable boat neck design. Most of their designs have a sexy backless style — but since they have dozens of styles, we highly recommend checking them out yourself.
Customer Review | “The quality of the material is unmatched! It fits perfectly and the sizing is great – definitely a swimsuit you will keep for a long time 🥰” – Rachael (Read more reviews.)
8. Andie
Best For | The perfect fit
Sustainable materials | Recycled nylon
Prices starting at | $112
Using feedback and wear tests from thousands of women, Andie’s swimsuits are designed by women and for women to fit your body perfectly, so no more tugging and pulling distracting you from a fun beach day. They’re super transparent about their sustainability specs, too, noting that about 75% of their products are currently made of recycled material and they’re working to raise that number. They carry a huge lineup of one-pieces, all of which are simple yet adorable, like the Amalfi one-piece that comes in lots of fun colors and patterns, the Malibu one-piece with a fun button-up design, and the Pana one-piece made of a recycled eco-nylon.
Customer Review | “Love this one-piece – I’m a 34DD and 28/29 bottom and the medium long torso fits beautifully and the top stays up and keeps the girls in place! I could not be more excited to wear this suit. It makes me feel so sexy and stylish. 10/10 recommend!” – Morgan (Read more reviews.)
9. Left on Friday
Best For | Supportive tops
Sustainable materials | High-quality, compressive imported fabric
Prices starting at | $180
All of Left on Friday’s suits have simple, streamlined designs, made to keep you feeling comfortable and secure while you’re surfing or otherwise being active in swimwear. They use a buttery soft Smoothing Dream Fabric™ from Italy for all their swimsuits, designed to be comfy, smoothing, fade-resistant, and snag-resistant, so these suits are made to stand the test of time. We love the laid-back sexiness of the weekender suit, with a backless design and a V-neck that’s still supportive, or the versatility of the streamline suit, with a scoop back, a square neck, and tank top straps. They have some other fun designs, too, like a one-shoulder option or some with cutouts, and all the suits come in a handful of trendy solid colors.
Customer Review | “Love this one-piece– I feel like it took me forever to find one that fits as well as this. This suit is super comfortable and has enough compression and coverage to feel good while doing something athletic in it, but also flattering and cheeky enough just for tanning on the beach days.” – Sarah M. (Read more reviews.)
10. Cosabella
Best For | Curvy bodies
Sustainable materials | Anti-pilling, snag-resistant synthetic material
Prices starting at | $235
While Cosabella has been well-known since the ‘90s for their adorable and affordable lingerie, they have a fantastic swim lineup, too. Their curated swim collection included elegant silhouettes that are timeless yet sensual, like the shaping bandeau swimsuit that’s strapless or the vita marina strappy one-piece with a plunge neckline and an open ring detail in the back. Both suits come in curvy options, too, to better accommodate fuller busts. All suits give you UPF 50+ sun protection and are pill- and fade-resistant so you can wear them for years to come.
Customer Review | “Perfect fit – sculpts me in right places and great fabric! The high cut of the suit lengthens the legs, with the perfect flattering rear coverage. The color was a bit less bright than the photo but I love it.” – Linda B. (Read more reviews.)
11. Boden
Best For | Fun, elegant patterns
Sustainable materials | Recycled polyester and polyamide
Prices starting at | $110
Beloved British brand Boden has been around since the ‘90s. And while they’re known for their timeless womenswear and kids’ clothes, they also make a lineup of swimwear that we can’t get enough of, full of fun yet sophisticated patterns and feminine silhouettes. Their Porto V-neck swimsuit has a plunging neckline but supportive straps and a full coverage bottom, while their Evia ruffle swimsuit has ruffled straps for a structured silhouette and their Rhodes cup-size swimsuit has a bustier top. All come in playfully decorative patterns and are made out of recycled polyester and polyamide, and Boden is committed to ethical production at every step of the supply chain.
Customer Review | “I absolutely love this swimsuit. It fits perfectly and the colors are so pretty! I can’t wait for the weather to warm up so I can wear it. For reference, I bought a size 4. I am 5’1″, 110 lbs, age early 50s.” – justme (Read more reviews.)
Featured image is from Summersalt
Natalie Gale is a Boston-based freelance journalist. Since 2022, she has been reviewing the top sustainable home, wellness, fashion, and beauty products, sharing her honest opinion on the best finds. When she’s not writing about art, food, or sustainability, you can find her biking to the farmers’ market, baking, sewing, or planning her next Halloween costume. Say hi on Instagram!
