Find your fit
Enter your measurements into our fit recommender to find your perfect size!
If you need help taking your measurements, use our guide below to find a guide on how to measure your bust size.
Finding your perfect Twnn Swim fit starts with two quick measurements. All you need is a soft measuring tape and a mirror.
Underband
Slip on a non-padded, underwired bra for the most accurate result.
- Wrap the measuring tape snugly around your ribcage, directly under your bust—right where your bra band sits.
- Make sure the tape is level and parallel to the floor all the way around.
- Take a deep breath out, pull the tape snug (but not tight), and note your measurement.
Overbust
Now for the magic number that helps us match you to your perfect cup size.
- Wrap the tape around the fullest part of your bust, going under your arms and across your back.
- Keep the tape straight and soft—no squeezing! Keep your arms relaxed by your side if someone’s helping you.
- Breathe normally and record your measurement.
Now that you’ve got your measurements, use our Size Calculator above to find your perfect fit in seconds — no guesswork, just great support!