I am 5'9", 165 lbs, 36B bra size with average size shoulders. Depending on reviews I read, I tend to order Medium or Large size tops but definitely lean more towards Medium tops. Based on reviews about this top, I ordered a Large. The top feels particularly tight in the chest area near the armpits and it goes up pretty high around the armpit area too...it's really weird. If it weren't for the odd fit, it would be 5 starts and a definite keeper. But considering the higher price point, I will likely return...I expect near perfection if I'm paying ~$80 for a workout top. For me personally, i don't see any cleavage which I love for workouts because I feel very secure but the great part is that. It is a great longer length crop top. It lands about an inch or so above my belly button. If you have a narrow chest and shoulders, this top may be a better candidate for you.