How to choose a mastectomy swimsuit: pockets, necklines, fit
Red Peony · October 1, 2026
Buying your first swimsuit after surgery can feel like shopping for a body you haven't quite got used to yet. Here's what's worth checking, in the order it tends to matter.
1. The pockets
Look for a pocket on both sides, even if you only need one. It keeps your options open, and a suit with pockets on both sides usually sits more evenly. Check that the pocket holds the form against your chest rather than letting it hang. If you can, try the suit on with the form you'll actually swim in.
2. The neckline
Lean forward in the changing room as if you're picking up a towel. If you can see the top of the form, or more of your chest than you'd like, the neckline is too low or too loose. Square and high round necklines tend to stay put best.
3. The underarms
Raise both arms above your head. The armhole should stay close to your body and cover the side of your chest. If you had lymph nodes removed and the area is still tender, notice where the edge of the armhole sits: a soft, flat edge is much kinder than a tight elastic one.
4. One-piece or tankini?
A one-piece gives the smoothest line and the most coverage, and there's only one thing to think about. A tankini is quicker to get in and out of in a changing room, easier for bathroom trips, and lets you mix sizes if your top and bottom are different. Neither is better; it depends on what annoys you more.
5. The fabric
You want enough stretch to move with you and enough body that the suit doesn't cling or go see-through when it's wet. Fully lined suits hide the outline of a form better. Chlorine is hard on spandex, so rinse your suit in cool fresh water straight after every swim.
6. The size
Start with your regular clothing size: that's the size we suggest for every Red Peony swimsuit. You can check it against the size chart by measuring your bust over the form you'll swim in, then your waist and hips. Still unsure? Send us your measurements and the style you like, and we'll tell you which size we'd pick.
A quick changing-room checklist
- Form sits flat and stays put when you bend and twist.
- Neckline covers what you want covered when you lean forward.
- Armholes stay close when you raise your arms.
- Straps don't dig in, and you can adjust them if you need to.
- You'd still like it if nobody knew it was a mastectomy swimsuit.
Ready to look? See our mastectomy swimwear and the size guide.
This article is general information, not medical advice. Please ask your surgeon or care team about your own situation.
