Start with your torso measurement, not your height

Height alone won’t tell you how a one-piece will fit. You could be 5'2" with long legs and a compact torso, or 5'9" with a shorter waist.

What actually matters is your vertical torso length (often called the torso loop). This tells you how much fabric you need from shoulder to crotch, helping you avoid that annoying slack fabric pooling at your lower back.

How to measure your torso loop:

• Grab a soft tape measure and hold it at the high point of your shoulder (right where your bra strap sits).
• Run the tape down across the fullest part of your bust.
• Bring it down between your legs and straight up your back, meeting back at your shoulder.

Fit tip: If your bust and hips put you in one size, but your torso measurement puts you in another, prioritise the torso for a one-piece. A customer recently shopping for our Mina One Piece ran into this exact dilemma – by matching to her compact torso rather than her standard dress size, she avoided that awkward excess fabric bunching around her waist.

Why straps slip or dig on a shorter torso (and what fixes it)

If your one-piece fits your hips but the straps constantly slide down your arms, the issue isn't your shoulders – the suit was just made for a taller frame!

Because standard straps are patterned for a longer torso, they sit slack and lose grip the minute you move. But sizing down to fix the strap length backfires: suddenly the suit is pulled taut vertically, digging painful red lines into your shoulders.

What to look for instead:

• Adjustable straps: Built-in sliders let you shorten or lengthen the strap so it sits flat and secure against your frame.
• Straps anchored closer to the neck: Straps set too far out on wide shoulders will inevitably slip on a more compact torso. (We updated the strap angles on our Celeste One Piece for this exact reason, so they sit flush without wandering).
• A firm underbust band: If the base band does the supportive work, your straps don't have to carry the load. Styles like the Nellie Scoop Top and Mina One Piece anchor support at the ribcage, keeping tension off your shoulders entirely.

Leg openings: the detail everyone forgets

When a one-piece has too much torso length, the whole lower half loses tension. The crotch drops, the leg seams slide out of place, and the elastic ends up sagging or rubbing uncomfortably against your upper thighs as you walk.

Sizing down to remove that slack creates the opposite issue: the leg openings shrink, pinching tightly right where you need freedom to move.

What to look for instead:

• Soft-finish edges
  Avoid thin, tight elastic cords that dig into your skin. Look for folded hems, flat bindings, or double-lined edges – like our Rose High-Waisted Swim Brief – so the leg opening sits flush without pinching or rolling.
• A moderate high-cut leg
  A slightly higher leg line naturally clears the widest part of your thigh and settles right into the bend of your hip. It stays in place without shifting, while also elongating your legs!

One-piece vs. two-piece for a shorter torso

Both work beautifully, but they tackle proportions differently:

• One-Piece (like Mina or Celeste): Creates a sleek, uninterrupted line that elongates the frame. The catch? Getting your vertical torso measurement right is essential to avoid chest gaping.
• Two-Piece (like Nellie or Sia with Grace or Alyssa): Lets you size top and bottom independently. If your bust, waist, and hips sit in different size brackets, separates eliminate torso-length tug-of-war altogether.

A quick fit-check routine before you wear it out

Before taking off the tags, give your bathers a quick living-room test:

✔️ The Sit Test
Sit on a low chair. Does fabric pool into folds at your stomach, or do the leg openings bite into your thighs? It should stay smooth and gently compressive.

✔️ The Reach Test
Stand up and reach both hands toward the ceiling. If the straps slide down or the neckline shifts, the torso length is off.

✔️ The Bust Check
If the hips fit well but the chest fabric gapes, you likely need a shorter torso length or an adjustable strap style – not a smaller cup size.

Frequently Asked Questions

How do I know if I have a short torso for swimwear purposes?

Take your full torso loop measurement (shoulder, through legs, back to shoulder) and compare it against the brand size guide. If it points to a smaller size than your hip or bust measurements, you have a shorter torso for one-pieces.

Why do my straps keep sliding off even though the swimsuit fits everywhere else

This almost always indicates a torso-length mismatch. If the suit’s body is even slightly too long, the downward tension disappears, causing the straps to sit slack.

Are one-pieces harder to fit if you're petite?

They can be trickier because the bust, waist, and hip are joined in one piece. Choosing designs with multi-way stretch, double lining, and adjustable straps can help solve this.

What should I look for in leg openings if I have fuller thighs?

Look for wider leg bands and folded or double-lined edges rather than thin, tight elastic that digs in.