Size 38O Swimwear
Also labeled UK 38K and EU 85O
Looking for swimwear in 38O? The fit comes down to a band that stays level and cups with enough room for an O cup. Compare labels across brands with our Swimwear Size Chart.
How a 38O Swimsuit Band Should Feel
Look for a band area wide enough to spread pressure around a 38 ribcage rather than a narrow strip that can roll. Sit down in the suit, since a band that feels fine standing can ride up or fold when you bend at the waist. Take a deep breath in the suit, and the band should move with you without pinching.
After your first swim, check the band again on dry land. If a larger band feels looser than it did dry, start on a firmer setting next time.
When 38O Swim Cups Gap or Spill
At this depth, the cups need full coverage at the sides and enough room at the base so the band can sit flat. If the cups feel full but the band rides up, firm up the band before looking at a larger cup. Gaping at the top can mean the cup is too deep or that the shape does not suit you.
On UK labels, this size is 38K. UK charts stop at K for this cup, since they double letters lower down.
Choosing Coverage for a 38O Bust
Coverage is a personal choice, but the edge of the cup should always lie flat. If a low neckline leaves you spilling at the top, the cup may be too shallow for 38O rather than the wrong letter. Try a fuller coverage cut before changing your size.
See also: 38O bras.
Frequently Asked Questions About Size 38O Swimwear
What is 38O swimwear in UK sizing?
UK labels print 38K and EU labels 85O, because the US O and the UK K are the same cup. Check which system each brand uses.
How should 38O swimwear feel after it gets wet?
It should feel close to how it felt dry, with the band still level and the cups still covering you. If the band feels loose after a swim, it was likely a little loose to begin with, which shows fast on a larger band.
Why do 38O one-piece straps dig into my shoulders?
Usually the torso is a little short or the band is not carrying enough of the weight. With an O cup, check both before tightening or loosening the straps.
Is it normal for 38O swimwear to fit differently between brands?
Yes. Brands cut cups and bands differently, so 38O can feel firmer in one suit and roomier in another. Use the size chart for each brand and judge the band and cups on you.
How can I check 38O swimwear fit at home?
Put the suit on, lean forward to settle into the cups, then stand and check the band in a mirror from the side. Raise your arms, sit and twist, then look for movement at the band or spilling at the cup edges.
Does a higher neckline give more support in 38O swimwear?
No, not on its own. A higher neckline adds coverage, but support for an O cup comes from the band and the depth of the cups. Choose the neckline you like once those two fit.