I am 5'5 145 lbs and the xs fit me, I normally wear M/L in most shirts (because I like a looser fit mostly) I am very average in build for most americans so if you are very skinny I don't know they would have sizes for you and for larger sized ladies I can say if you are more blessed in the chest these may also not work for you. One of the pull strings fell out and I had to sew it back in.