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Swim season is on — here’s where to shop the best bikinis and one-pieces
Discover 20 affordable brands that celebs love 👙
Swimwear shopping, like jeans shopping, should be fun – but let’s be real, it rarely is. Sure, we love a good haul as much as the next gal, but finding a bikini or swimsuit that’s flattering, stylish and supportive? Not exactly easy. Add in harsh changing-room lighting or your messy bedroom floor, and it’s no wonder the whole thing feels more stressful than sexy.
To take the pressure off, the Cosmo Fashion Team has rounded up our favourite swimwear brands worth having on your radar. Because deciding where to shop for your holiday wardrobe (or garden sunbathe) is half the battle. From OG swimwear pros serving up ultra-functional styles to high street heroes doing surprisingly chic resortwear – we’ve got you covered.
Need DD+ support? Prefer a micro bikini? Want a sexy plus-size option that actually fits? We’ve included swimwear for every shape, size and vibe. Bonus: there are sustainable brands for the eco-minded and celeb-approved picks for the trendsetters.
Whatever your style, budget or body, consider this your ultimate swimwear shopping guide. Keep scrolling for the 20 best swimwear brands to shop in 2025 – just in time for summer.
Hunza G
Hunza G is known as the OG crinkle swimwear brand worn by the likes of Kim Kardashian, Emily Ratajkowski, Hailey Bieber and Rosie Huntington-Whiteley.
Bikinis and swimsuits come in one size, with the seersucker fabric stretching to fit those who are a UK size 6-16. So even though pieces are a little on the spennier side (we're talking triple figures), they'll fit you for life – making them a sustainable choice, too.
Monday Swimwear
BFFs Tash Oakley and Devin Brugman found Instagram fame by taking photos of each other in bikinis, so launching a swimwear line of their own was a natural next step.
Fast-forward 10 years and their brand, Monday Swimwear, is a go-to for fashion gals everywhere, thanks to its laid-back LA aesthetic, luxurious materials and impeccable fit.
Lounge
Lounge is so much more than our go-to lingerie brand, it also designs super cute ready-to-wear, vintage-inspired accessories, and stunning swimwear. Priced at £70, this dreamy 'Midnight Tropic' bikini set looks so much more expensive than it is.
Ôsalé
Encapsulating the island feel of Ibiza, inspired by founder Aliya Wilkinson's childhood growing up on the sandy shores, Ôsalé swimwear somehow manages to be both glamorous and laid-back.
Ideal for a morning swim to a poolside sundowner and everything in between, the sustainable collections made largely from recycled fibres are designed by Aliya in Ibiza and made in Venice, Italy.
The brand counts Maya Jama as a fan. The Love Island host shared pics of herself on Instagram wearing the onyx Edie triangle bikini top and Isabel Brazilian bikini bottoms.
Boux Avenue
From supportive underwiring to flirty prints, Boux Avenue has translated some of its sexy lingerie signatures into its swimwear edit. While some designs come in UK dress sizes (spanning a 6-18), others including bikinis and swimsuits are available in cup sizes, starting at a 28A through to a 38G in select styles.
Away That Day
If you’re after swimwear that’s both sexy and sustainable, look no further than London-based brand Away That Day. All of its pieces are made using innovative planet-friendly fabrics that stand the test of time, and its ultra-flattering, mix-and-match bikinis are fast becoming a summer holiday essential.
Triangl
Triangl was founded in 2012 by then-couple Erin Deering and Craig Ellis. After struggling to find an appropriate bikini for her second date at the beach with Craig (oh how the Australian dating scene differs to the UK), the two realised there was a gap in the market.
Despite Erin exiting the business and the relationship in 2018 after having two children with Craig, the business is still thriving and has racked up endless celeb fans including Margot Robbie, Hailey Bieber and Camila Mendes.
The latest collection – Mirage – features vibrant prints inspired by life in the desert.
Agent Provocateur
Lingerie brands know how to craft a perfectly fitted swimsuit – and Agent Provocateur proves it. Their swimwear collection pairs expert, supportive construction with the brand’s signature, sexy silhouettes. From bold cut-outs to high-shine fabrics, every piece is designed to turn heads, whether you're poolside or beach-bound.
Balzac Paris
Recreate that French girl chic style at the beach thanks to Balzac Paris's swimwear collection full of vibrant colours, playful prints (leopard, a brand signature, of course features) and cuts that enhance the silhouette. Struggling to decide exactly what to add to bag? Each piece comes with style notes, including a fit guide on what body types and bust sizes it's best suited for.
Oceanus
It doesn't get more fun, colourful or boujie than Oceanus swimwear! Designed with the intention of turning heads, each piece is made from recycled, eco-friendly materials and hand-embroidered with Swarovski crystals, often in pretty, nature-inspired patterns. It's the confident glamour of the '80s, applied to the beach.
Form and Fold
Big-boobed babes, listen up! Your days of self-conscious swimwear shopping are finally behind you, thanks to this game-changing Aussie brand. Form and Fold’s pieces are exclusively designed for D+ cups, using lingerie construction, premium materials and a fit process to ensure every single style is supportive and stylish AF.
Oséree
Known for its luxe, shimmering fabrics in skimpy, barely-there cuts, Oséree is the London-based label launched by CSM grads Isabella and Jannine in 2015.
A fan of the brand, Dua Lipa was recently spotted wearing the Animalier bikini while on holiday this summer.
Frankies Bikinis
Mother-daughter duo Mimi and Francesca Aiello started out designing bikinis from their Malibu home in 2012. Their Y2K-inspired silhouettes and bold use of colour and pattern made the brand an immediate success, going on to collaborate with the likes of Pamela Anderson, Sydney Sweeney and Gigi Hadid. They've since expanded into ready-to-wear clothing and accessories too, but swimwear remains their number one.
Bluebella
If you prefer to travel light, make sure to pack a few of Bluebella’s new one-pieces in your carry-on. With their textured fabrics, modern silhouettes, and luxe metal details, they’re designed to work frombeach to bar and beyond. Trust us, they’ll end up being some of your most-worn pieces, and they’re fabulously affordable, too.
Vuori
Vuori is one of our favourite fitness brands, so if you're planning on taking your swimwear down to the local lido or putting it through its paces in any activity more strenuous than sunbathing, this is the brand for you. The brand's streamlined collection features one-pieces, bikinis and swim shorts to offer a range of coverage options, with select pieces incorporating UPF protection for all-day sun support.
SKIMS
Kim Kardashian’s best-selling fashion brand is praised for its shapewear solutions, but the SKIMS swim edit – modelled by Kim herself, ofc – is pretty insane too. As well as offering the teeny tiny styles favoured by the Kardashian / Jenners, more modest options are available too, all in a neutral colour palette alongside pops of red and pink.
Reformation
Reformation's swimwear line rivals the brand's cult dresses for number one spot in our shopping baskets. While some pieces are made from ECONYL leftovers, others trial the brand's new, non-synthetic fabric, EVO by Fulgar – a renewable, super soft, biobased fibre that contains no plastic and comes from the castor plant. We'll take one of everything, please!
Jaded Swim
Jaded London nails the art of counterculture cool, and its Y2K-inspired Swim collection is no exception. Expect rebellious crochet sets in colour-block prints, skimpy bikinis covered in tactile embellishments, and drapey, sheer mini dresses that take you back to Beyoncé's Crazy in Love era.
Seafolly
Australian brand Seafolly was born on Bondi Beach in 1975 but is now available in over 50 countries. As well as covering the basics –triangle and bandeau bikinis alongside flatteringly ruched one-pieces – pretty pastel colourways and vibrant prints adorn every edit. In an effort to be more transparent with its sustainable initiatives, the brand's core collection is made from 80% recycled nylon while the SS24 drop has been crafted from 60% regenerated fibres.
Fruity Booty
Fruity Booty is the lingerie brand putting headstock fabrics to good use, loved by fashion It-girls and celebrity cool girls alike. The brand's swim, like its underwear, consists of colourful, bold prints decorating teeny tiny string silhouettes. The bottoms are even cheekier this season, after none other than Kendall Jenner herself put in a special request via Instagram DM. You can't separate a Jenner and her penchant for micro bikinis.
Kara Kia is the Ecommerce Editor for Women's Lifestyle at Hearst UK, leading Cosmopolitan UK's digital shopping strategy across fashion, beauty and lifestyle. With over eight years of experience as a journalist and editor, Kara specialises in skincare, makeup, haircare and helping women find their personal style — trying and testing every product she recommends. A trusted voice in fashion and beauty ecommerce, Kara's most-read guides include the best wedding dresses under £1000, the best affordable jewellery brands, the best Korean skincare products, and the best products for curly hair. She also covers major shopping events including Black Friday and Amazon Prime Day for Cosmopolitan, Red and Prima. Kara previously held the role of contributing Fashion and Beauty Ecommerce Editor at ELLE UK and Harper's Bazaar UK; before joining Hearst, she was Fashion Content Editor at NET-A-PORTER's Porter Magazine, Associate Editor at PopSugar, and wrote for Refinery29 and LOVE Magazine. An experienced interviewer, she has spoken to Zendaya, Alicia Keys, Simone Biles and Tyla about life, work and style. Born and raised in Kingston, Jamaica and formerly based in Toronto, Kara now lives in London. Follow Kara on Instagram @kara.kia
Alexandria Dale is the Digital Fashion Writer at Cosmopolitan UK. Covering everything from the celebrity style moments worth knowing about to the latest fashion news, there’s nothing she loves more than finding a high street dupe of a must-have designer item. As well as discovering new brands, she’s passionate about sustainable fashion and establishing the trends that are actually worth investing in. Having worked in fashion journalism for six years, she has experience at both digital and print publications including Glamour and Ok!
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