Size 38M Swimwear
Also labeled UK 38J and EU 85M
38M swimwear should feel secure in the water and comfortable on land. With a very full, projected cup, that means real cup depth and a band that does not ride up. Use our Swimwear Size Chart to check how each brand labels it.
When the 38M Band Loosens Once Wet
In a one-piece, a 38 band works together with the side panels, so check the fit under your arms as well as at the back. Sit down in the suit, since a band that feels fine standing can ride up or fold when you bend at the waist. If you are unsure, judge the band first and the straps last.
Run a finger along the lower edge of the band. On a larger band it should sit flat with no rolling, and it should not leave a deep mark after you take the suit off.
When 38M Swim Cups Cut In at the Edge
At this depth, the bottom edge of the cup should sit right in the fold under your bust. Projected cups need the band anchored firmly so they do not tip forward when you move. Check the center of the suit between the cups, which should sit close to your chest.
The UK label is 38J. A UK J is a US M, while a US J is three cups smaller.
When a 38M One-Piece Feels Too Short
If one-pieces always feel short or long in the body, separates are worth a look. You can match the top to your 38M bust and the bottoms to your hips, even when those sizes do not line up. Check that a tankini top stays level at the band when you lift your arms.
Need a bra in the same size? See our 38M bras.
Frequently Asked Questions About Size 38M Swimwear
Which UK label matches US 38M swimwear?
US 38M is labeled UK 38J and EU 85M, and that UK J is not the same as a US J. Read the size system on every tag.
Can I wear my usual 38M bra size in swimwear?
Yes, your 38M bra size is the right place to start for swimwear sized by band and cup. Swim cuts vary, so with a very full, projected cup check the band and cup edges in each suit rather than trusting the label alone.
Why does my 38M swimsuit band ride up in the water?
Most often, the band has loosened once wet and is no longer anchoring a very full, projected cup. Refasten it more firmly and check the fit again after a few minutes in the water. Tighter straps tend to make it worse.
How do I know if a 38M one-piece is too short in the torso?
The straps dig into your shoulders, the leg openings pull up, and the suit feels like it is dragging down. With a very full, projected cup, the bust uses extra length, so check the torso fit while sitting as well as standing.
Is a tankini a good option for a 38M bust?
Yes, a tankini can help when one-piece torso length is the problem, because the top and bottom are separate. The top still needs cups deep enough for 38M and a band that stays firm, which matters even more on a larger band.
What should I do if 38M swim cups gap at the top?
Settle your bust into each cup first, then check again. If the gap stays, the cup shape may not suit you or the cup may be a little deep for a larger band, so compare a different coverage before changing size.