A one-piece swimsuit is doing more structural work than any other piece in a summer wardrobe — it's a single panel of cloth holding tension across the body in five directions at once. Get the cut right and it disappears. Get it wrong and you fidget all afternoon.
1. Pick the neckline that works with your shoulders
Square necklines elongate a shorter neck and balance broad shoulders. Deep V-cuts open up the décolletage and work best on narrower frames. Scoop necks are the most universally forgiving — they sit cleanly under cover-ups and don't shift when you reach for a glass.
2. Look at the leg cut from the side, not the front
High-cut legs visually lengthen the body, but only work if the leg opening sits clean against the hip — not gaping, not cutting. The clearest test: lift your knee toward your chest. The opening should hold its line. If it pulls away from the leg, the rise is wrong for your hip-to-waist ratio.
3. Check the lining
A swimsuit that's lined only through the bust will go semi-transparent in a wet white or pale tone. A fully-lined edge-to-edge suit holds its colour wet and dry. If the product page doesn't say, ask. (Ours are lined edge-to-edge — it's not a footnote.)
4. Support comes from the band, not the strap
Real bust support in a one-piece comes from a structured band sitting flat under the chest — straps just hold the cloth in place. If a suit relies on thin straps to do the lifting, you'll feel it within an hour. Look for a wide underband, an internal sling, or moulded cups.
5. Trust the fabric weight
A heavier swim fabric (around 200gsm and up) sculpts; a featherweight fabric drapes. Heavier suits are kinder to the body and last longer; lighter suits dry faster and pack smaller. There's no "better" — there's just what your day looks like.
Two things we'd never tell you
That sizing up "to be safe" is a good idea — a suit needs slight compression to hold shape in water, and a loose suit fills with water and sags. And that any single style is universally flattering — it isn't. Your body is specific. Buy for it.
Browse our current one-piece edit — each silhouette is fit-tested across four body types before release.