20SwimmingCostumeStylesforWomentoTryin2026

A good swimming costume does far more than get you into the water. The right one-piece can smooth, support, lengthen and flatter, and it can double as the starting point for a whole holiday outfit. In 2026, one-piece swimsuits are firmly back at the centre of swimwear fashion, with classic cuts sitting happily beside sculptural necklines, bold prints and sporty zip-front styles.

Whether you swim laps every week, you are packing for a beach holiday, or you simply want a swimming costume that makes you feel confident at the pool, this guide covers twenty styles worth trying.

Key Takeaways

• A classic black one-piece swimming costume is still the most versatile buy: it flatters every shape, suits every age and works from the local pool to a five-star resort.
• Fit matters more than size: look for adjustable straps, a shelf bra or underwiring for bust support, and ruching or tummy-control fabric for gentle shaping.
• Chlorine-resistant fabric lasts far longer than standard nylon for regular swimmers, while recycled ECONYL nylon is the more sustainable choice.
• A swimming costume can be styled as a bodysuit, so one good suit covers beach days, poolside lunches and evening drinks.
• Expect to pay around £25–£45 on the high street, £60–£110 at mid-range brands, and £150 or more for designer swimwear.

In This Article

• Classic One-Piece Swimming Costumes That Never Date
• Flattering Swimming Costumes for Every Body Shape
• Sporty and Practical Swimming Costumes
• Statement and On-Trend Swimming Costumes for 2026
• Holiday Styling: Wearing Your Swimming Costume Beyond the Pool
• How to Choose the Right Swimming Costume
• Frequently Asked Questions

Classic One-Piece Swimming Costumes That Never Date

Classic styles work year after year.

1. The Classic Black Scoop-Neck One-Piece

Every swimwear drawer needs a plain black one-piece: a scoop neckline suits most bust sizes, a moderate leg line flatters the thigh, and black is naturally slimming. Try the M&S Tummy Control Scoop Neck Swimsuit, around £35, or Boden’s styles at closer to £70.

2. The Navy Halter-Neck Swimming Costume

Navy is softer than black against most skin tones and looks wonderfully fresh beside the sea. A halter neck draws the eye upwards, gives good bust support and suits broader shoulders, while tie straps let you adjust the fit exactly. John Lewis stocks several navy halter styles from around £45, often with a matching sarong.

3. The Square-Neck Retro One-Piece

Square necklines have a lovely vintage feel, echoing the elegant swimwear of the 1950s. The straight-across cut frames the collarbones, supports the bust without a plunge, and suits smaller busts particularly well by creating width across the chest. ASOS Design offers square-neck one-pieces from around £28.

4. The Timeless Striped Swimming Costume

Breton stripes never really leave fashion, and on a swimming costume they feel both nautical and chic. Vertical or diagonal stripes are the most flattering because they lengthen the torso, while a classic navy-and-white horizontal stripe works best on a simple, straight-cut suit. Boden and Joules both do striped one-pieces most summers, usually priced between £60 and £90.

Flattering Swimming Costumes for Every Body Shape

Flattering swimwear is about choosing the details — ruching, draping and the right neckline — that make you feel confident.

5. The Ruched Tummy-Control Swimming Costume

Ruching is the single most useful detail in swimwear design: gathered fabric across the waist disguises the tummy, defines the waist and adds a soft drape that plain fabric cannot match. Pour Moi’s ruched one-pieces, around £42, are a good mid-price option, while Miraclesuit’s shaping styles are the premium choice at £150 or more.

6. The Underwired Swimming Costume for a Larger Bust

If you wear a D cup or above, an underwired swimming costume changes everything: it lifts and separates the bust like a good bra, so the suit supports you properly instead of flattening you. Look for a bra-sized fit (sold by cup size, not dress size), adjustable straps and a firm underband. Bravissimo and Pour Moi both specialise here, with underwired one-pieces from around £45 to £65. Our guide to tankini outfits shows how to get the same support from a two-piece.

7. The Long-Torso Swimming Costume

If standard swimsuits pull at the shoulders or ride up, you probably need a long-torso fit. Longer-body styles add extra length through the torso, so the suit sits properly on the shoulders and the leg line stays where it should. Several UK brands, including M&S, offer long-length options at no extra cost; check for “longer length” before ordering.

8. The Plus-Size Wrap-Front Swimming Costume

A wrap-front swimming costume is one of the most flattering shapes for curvier figures: the crossover front creates a V-neckline, defines the waist and gives adjustable coverage over the bust. It suits apple and pear shapes equally well, because the diagonal lines draw the eye to the narrowest part of the waist. Simply Be stocks wrap-front one-pieces from around £30, in sizes up to 28.

Related: beach bag outfits

Sporty and Practical Swimming Costumes

If you swim laps, surf or join aqua classes, you need a suit that stays put and stands up to chlorine.

9. The Racerback Lap-Swimming Costume

The racerback is the classic training cut: the straps meet between the shoulder blades, leaving the arms completely free, and the close fit means nothing shifts during a tumble turn. Speedo’s Endurance+ Medalist, around £38, is the benchmark: chlorine-resistant, durable, and widely available in colours and sizes.

10. The Zip-Front Sporty One-Piece

A front zip makes a swimming costume much easier to get on and off, which matters after a cold open-water swim or a beach workout. Zip-front suits also offer adjustable coverage: zip up for laps, unzip slightly for sunbathing. Sweaty Betty’s swim styles, around £95, are designed with active women in mind and often include recycled fabrics and a flattering high neckline.

11. The Long-Sleeve Surf Suit

Long sleeves are the cleverest answer to sun protection: a long-sleeve surf suit gives UPF 50+ coverage across the arms and shoulders, so you need far less sunscreen and stay comfortable in and out of the water. It is the best choice for surfing, bodyboarding and long beach days with children. Prices start at around £40 and rise to £120 or more from surf brands.

12. The Chlorine-Resistant Training Costume

If you swim more than twice a week, a chlorine-resistant swimming costume is worth every penny. Standard swimwear fabric can fade, sag and lose its elasticity within a few months of regular pool use, while polyester-based training fabrics such as Speedo’s Endurance+ or Zoggs’ Ecolast hold their shape for a full season or more. Expect to pay around £30–£50.

Statement and On-Trend Swimming Costumes for 2026

In 2026, the direction is sculptural shapes, rich colours and interesting textures. ELLE’s edit of the chicest swimsuits of 2026 highlights crinkle fabrics, bold colour and one-pieces designed to be seen, not hidden under a cover-up.

13. The Sculptural Cut-Out One-Piece

Cut-outs are the defining detail of 2026 swimwear: a well-placed cut-out at the waist, under the bust or at the side creates shape and interest without sacrificing support, turning a simple black suit into a statement piece. The trick is placement — side cut-outs suit most figures, while a waist cut-out with a ring detail flatters the midriff. Who What Wear’s round-up of cool one-piece swimsuits shows how designers use cut-outs, colour blocking and metallic details to make one-pieces feel fashion-forward.

14. The Bold Colour-Block Swimming Costume

Colour blocking is back in a big way for 2026, with burgundy and cream, cobalt and white, and chocolate and black among the most-worn combinations. A colour-block suit uses contrasting panels to create the illusion of a smaller waist or a longer torso, so it is flattering as well as fashionable. The brand Same is famous for this look, and high-street versions appear at ASOS and River Island from around £35.

15. The Textured Crinkle One-Piece

Crinkle fabric is the secret behind the one-size-fits-all swimwear that has become so popular in recent years. The textured, stretchy material moulds to the body, forgives small size changes and never needs ironing, which makes it ideal for packing. Hunza G is the best-known name here, with signature square-neck crinkle one-pieces priced around £170.

16. The Elegant One-Shoulder Swimming Costume

One-shoulder styles bring instant glamour to the beach: the asymmetric neckline elongates the neck, shows off one collarbone and looks wonderful with hair swept up and statement earrings. This shape suits smaller and medium busts best, because a single strap offers less support than two, so look for a firm underband or light boning if you need extra hold. Expect £50–£90 at mid-range brands, with designer versions from £150 upwards.

Holiday Styling: Wearing Your Swimming Costume Beyond the Pool

These four ideas take one suit from the beach to dinner.

17. The Swimming Costume as a Bodysuit with Linen Trousers

The simplest holiday trick is to treat a plain one-piece as a bodysuit: a black or navy scoop-neck suit tucked into white or stone linen trousers looks like an expensive top, especially with a belt and flat leather sandals. It is cooler than a blouse in the heat, never comes untucked, and takes you from the beach to a restaurant without changing. Our guide to summer dresses, the best styles to wear this season has more warm-weather ideas.

18. The Swimming Costume with Denim Shorts

Denim shorts and a one-piece is the classic beach-day uniform, and it works because the proportions are so easy: a fitted top half and a relaxed bottom half. A bright or printed swimming costume stops the outfit looking plain, while a black suit with light-wash shorts looks effortlessly French. See our denim shorts outfits for evening ideas too.

19. The Swimming Costume with a Sarong and Sandals

Nothing says holiday quite like a sarong: tie it at the hip for a skirt, at the waist for a dress, or knot it at the neck for a halter cover-up, and you have three outfits from one piece of fabric. A sarong in a colour that picks up your swimming costume — coral with navy, white with black, gold with emerald — looks intentional rather than thrown together. Finish with flat leather sandals and a woven tote.

20. The Swimming Costume with a Sheer Cover-Up and Holiday Nails

For evenings, a sheer or crochet cover-up over your swimming costume is the quickest way to look dressed up without changing. A white crochet midi dress over a black one-piece, or a sheer black kaftan over a jewel-coloured suit, looks deliberate and glamorous, and suits poolside dinners and sunset drinks perfectly. Add a slick of lipstick and freshly painted nails — see our summer nails guide for the season’s best colours.

How to Choose the Right Swimming Costume

Start with the fit, not the fashion. Try the suit on and sit down in it: if it digs in at the shoulders or pulls across the bust when seated, it will only feel worse after an hour in the water. The leg line should sit comfortably without cutting in, and the straps should stay put when you raise your arms above your head.

Fabric matters too. For regular swimming, choose a polyester-rich, chlorine-resistant blend; for holidays, a nylon-spandex mix feels softer and more luxurious. Always rinse your suit in cold fresh water after swimming, dry it flat in the shade, and never wring it out or tumble dry it — heat destroys the elastic fastest.

Frequently Asked Questions

What is the most flattering swimming costume for women?

A ruched, tummy-control one-piece in a dark colour is the most universally flattering choice, because the ruching disguises the waist and the dark shade slims the silhouette.

How much should a good swimming costume cost?

High-street one-pieces cost around £25–£45, mid-range brands charge £60–£110, and designer swimwear starts at about £150. For regular pool swimming, a £35–£40 chlorine-resistant suit is good value.

How do I choose the right size swimming costume?

Check the brand’s size guide and measure your bust, waist and hips rather than guessing from your dress size. If you are between sizes, size up in firm shaping fabrics and size down in stretchy crinkle styles.

Are one-piece swimming costumes in fashion in 2026?

Yes, one-piece swimsuits are one of the strongest swimwear trends for 2026. Fashion editors are favouring sculptural cut-outs, colour blocking, crinkle textures and one-shoulder styles

What is the best swimming costume for lap swimming?

A racerback one-piece in chlorine-resistant fabric is the best choice for laps. Speedo’s Endurance+ styles, around £38, are the standard recommendation: they stay in place and keep their shape for a full season.

How should I wash a swimming costume?

Rinse it in cold fresh water immediately after swimming, hand wash it with mild detergent, and dry it flat in the shade. Do not wring it, do not machine wash it on a hot cycle, and never tumble dry it.

Can I wear a swimming costume as a top?

Yes, a plain one-piece works beautifully as a bodysuit with linen trousers, denim shorts or a midi skirt. Choose a smooth, well-lined suit in black, navy or a solid bright colour

Which swimming costume suits a larger bust?

An underwired, bra-sized one-piece with wide adjustable straps gives the best support for a larger bust. Look for a firm underband, a full lining and cup-sized fitting from brands such as Bravissimo or Pour Moi

The Business Outstanders editorial team writes practical fashion guides for women in the UK, US and Canada, covering outfits, swimwear, nails, hair and wedding style. Every guide is researched from current collections and high-street and designer retailers, and updated for the season.