Whether you're jetting off to sunnier shores on holiday, heading to your local park or lido, or simply lying out in your back garden, your summer attire *needs* to include a swimsuit. Sure, we love a bikini as much as the next gal, but one-pieces are a huge SS25 swimwear trend – and for good reason.
Not only do they offer more support and coverage (ideal for protecting against UV rays and if you're prone to forgetting to top up your SPF), a swimsuit can double up as a top when worn with denim shorts or a chic sarong beach cover-up. Meaning you can save valuable space in your carry-on to squeeze in just one more summer dress or an extra pair of shoes. Now that's sound style logic.
To help you find the right one-piece swimwear for you, we've rounded up the hottest styles available to shop now in some of this season's biggest silhouette, print and colour trends.
Monochrome
It feels like every swimwear brand has given its take on a black one-piece with white edging this summer. Boux Avenue even offers its best-selling Rivoli Swimsuit in the inverse colourway, too! All feature slightly different design details – be it New Look's underwired cups or Mint Velvet's tie shoulder straps – at varying price points, so there really is a monochrome swimsuit for everyone.
Crinkle
Hunza G may be the OGs of seersucker crinkle swimwear, but in recent years, the high street has caught on to the fabric's appeal, offering their own take on the trend at a more purse-friendly price tag without compromising on the luxe textured finish. Comfortable, flattering, and with unique stretch and recovery properties, you can find crinkle swimwear in every shade of the rainbow.
Sculpting
Let's get one thing straight: *every* body is beach body ready, but some people do feel a tad uncomfortable stripping down to just their swimwear. To help you feel your best and most confident so you can focus on enjoying your time in the sun, look for designs that encompass sculpting properties. Une Piece designs feature ingenious InvisiBust Support Technology that includes a full lining and panelled bodice to provide a supportive and firm fit, while M&S's 360 Tummy Control consists of an in-built power mesh. Alternatively, details like ruching are super flattering.
Belle The Label The Ruched Maillot One-Piece Swimsuit
Embellished
Blame it on the boho revival, but when it comes to accessorising in 2025, more is more! That mantra has extended to our wardrobes with added embellishments adorning swimsuits in the form of sun-catching sequins, delicate beading and heavy-hitting studded hardware. Oceanus can't be beaten when it comes to embellished swim with endless designs and colourways that are perfect for hen dos or honeymoons that more than justify the triple figure price tag.
Low-back
We know we said swimsuits provide more coverage, but there are plenty of skimpy styles should you want something to rival your teeny tiny bikini on the sexy scale. Our favourite silhouette is a low-back design. Toco Swim's Celeste One Piece features criss-cross tie straps that can be tightened to cinch you in and offer a flattering custom fit, while adding interest to the back of your suit.
Underwire
For gals with big boobs who require a little extra support in the chest area, an underwired swimsuit might be more of a need than a want. Luckily, the fashion has caught up with the technology to offer plenty of styles that are as pretty as they are practical. Just look at Seafolly's picnic printed design in the pattern of the moment, gingham.
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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!
