According to the Halfdays website, I should be a small (I'm a 34B for reference). I do not like a sports bra to be too tight so I got a medium. The fabric is very stiff and I could barely get the thing on. I tried a large and it was so big that it was just laying around my chest rather than stretching around it. I did, due to availability problems, end up getting two different colors which may have compounded the sizing issue but I think the main problem is that the fabric just isn't very stretchy which makes it very hard to fit. Returned both sizes.
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