I'm a m/l size in most things....depending on the maker and design. i tried this vest on with the paired top in the photo and couldn't believe how big and boxy it was. very boxy. it looked dumpy on my 5'3" frame. i thought it might work because i have broad shoulders to hang the vest off,but noooo. i have breast and that ruined it. well there you go, a size 36c wasn't going to help with this one. but i'm going to try sizing down to a small to give it a chance in fitting better. it runs at least