I bought a medium and usually need a small size 8. It fits a little looser than I'd like but OK. The S shows a bust of 34.25 and the XS of 32.25 on backcountry.com if you want more measurements. It's a great top, I love it.
My icebreaker states it is a small. This is a generous small. I have ordered XS before the the icebreaker is snug. this one fits very well.
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