I'm 5'1" around 90lbs with a 33" bust. I got the XS and it fits to a T. I'm used to clothes being roomy on me so I was surprised when the XS fits like... an XXS from say, Madewell. The arm holes and chest all fit perfect, like, no-dryer-please perfect. I think you should size up if your chest measurement is above average (mine is, for my size that is ha), and also if you have broader shoulders.
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