A shaping swimsuit differs from ordinary swimwear on one point: under the outer fabric lies a second, firmly elastic layer that distributes pressure over the stomach, waist and lower back. That lining — usually a densely knitted mesh of polyamide with elastane — shapes your silhouette for as long as you wear the suit, even in the water. Pleats at the front (ruching) optically mask what the lining doesn't smooth away.
Swimsuit, shaping bikini or ordinary swimwear
The choice between a shaping swimsuit and a shaping bikini is mainly a choice between coverage and freedom. The table sets out the differences.
| Feature | Shaping swimsuit | High-waist shaping bikini | Ordinary swimwear |
|---|---|---|---|
| Shaping lining | Continuous across stomach, waist and back | In the bottoms, up to above the navel | None |
| Camouflaging the tummy | Strongest, especially with ruching | Good for the lower belly | Not at all |
| Waist | Shaped by compression | Accentuated by the high waistband | Unchanged |
| Sun on the skin | Arms, legs and neckline | Entire midriff stays covered up to the navel, rest is bare | Maximum |
| At Novyre | LumaShape Swimsuit | LumaShape Bikini Set | — |
How the shaping lining works
Compression in swimwear works the same way as in shapewear: a dense knit with relatively high elastane content spreads the volume of the stomach and waist over a larger surface, making the silhouette look sleeker. The difference lies in the material requirements — swimwear must be chlorine- and salt-resistant and hold its shape when wet.
Ruching optically reinforces that effect. The pleats break up the continuous line the eye would otherwise follow across the stomach; small irregularities disappear into the relief of the fabric. The LumaShape Swimsuit combines a tummy-control lining with ruching across the front panel and mesh inserts, and is lined with eco material.
Which style suits which figure
Full stomach and a wider waist: choose a swimsuit with continuous ruching in a dark colour. The combination of compression, pleats and light absorption works on three fronts at once. Full hips and bottom: a high-waist bikini shapes the lower abdomen with the high-cut bottoms, while a more eye-catching top draws the eye upward. The LumaShape Bikini Set is built on this principle: high-waisted bottoms with shaping and a top with support.
Narrow waist with balanced shoulders and hips: both styles work; choose based on how much waist emphasis you want. Straight torso without a defined waist: ruching combined with a high waistband suggests a curve that isn't anatomically there, the most effective optical tool for this figure type.
In all cases, avoid thin, smooth single-layer fabric without lining: it shows every contour and corrects nothing.
The right size: take water into account
Wet fabric becomes heavier and gives slightly. So choose your usual size, and if you're between two sizes, go with the smaller one: a shaping swimsuit should fit tighter than a T-shirt, without cutting into the groin or shoulders. Adjustable straps accommodate differences in torso length; check that the lining doesn't fold anywhere, since a fold in the inner layer will show on the outside. Both LumaShape styles run from S to 3XL; the size guide matches your body measurements to the right size.
Tip: try on a shaping swimsuit both standing and sitting. A suit that only fits well standing will start cutting into the groin or underarms within an hour at the poolside.
Colour and print: what works visually
Dark, matte colours absorb light and have a slimming effect; shiny fabric reflects light and visually enlarges. Vertical and diagonal lines elongate the torso. For prints, a simple rule applies: small, busy patterns draw attention to the area they cover, while large, calm patterns camouflage. If you want to play down the stomach and emphasise the neckline, combine a plain dark midsection with colour or print at the top.
Care: chlorine is the biggest wear factor for the lining
Elastane loses its elasticity through chlorine, salt and sunscreen oil, and the compression lining feels this first. Rinse a shaping swimsuit in cold water immediately after swimming, hand wash it without wringing, and dry it flat in the shade, never on a radiator or in the dryer. This way, the lining keeps its strength for several seasons. If the inner layer ripples while the suit is off, the compression is worn out and it's time for a replacement.
For beside the pool
The same shaping principle exists for wear under clothing, with different materials and finished heights. For guidance on choosing between briefs, shorts and a bodysuit, see the guide on shapewear for your stomach.
Frequently asked questions about shaping swimwear
Does a shaping swimsuit really make you look slimmer?
Visually, yes: the compression lining redistributes volume around the stomach and waist, and ruching masks what remains. The effect is visible as soon as you put the suit on and disappears once you take it off.
How tight should a shaping swimsuit fit?
Tighter than regular swimwear, since wet fabric gives a little. It should never cut in at the groin, shoulders or underarms, and you should be able to breathe and move freely.
Which size shaping swimsuit should I choose?
Your usual size; if you fall between two sizes, take the smaller one. Adjustable straps correct differences in torso length better than sizing up or down.
Can you actually swim in a shaping swimsuit?
Yes. The lining still works when wet and doesn't restrict your stroke. Do rinse the suit in cold water straight after chlorinated water, as chlorine breaks down the elastane in the lining.
Which swimsuit best hides a tummy?
A style with continuous ruching across the front panel, a lining that extends below the bust, and a dark, matte colour. These three elements together give the strongest result.
What's the difference with shapewear worn under clothing?
The principle is the same, the material is not: swimwear is chlorine- and salt-resistant and dries quickly. Shapewear for under clothing isn't made for water and loses its fit in it.
How long does the shaping effect last?
With cold rinsing, hand washing and drying in the shade, several seasons. Chlorine, sun oil and the tumble dryer shorten its lifespan; a rippling lining is the sign it's time for a replacement.
Written by Team Novyre — specialists in seamless underwear. Last updated: 4 June 2026.
