This was one of those items in my haul that I wasn’t expecting to be as good as it is! I am 5’9” 133 lb and a 32 ddd. I ordered an xs and it fits so perfectly. Typically with these types of shirts I get really bad side boob. But not with the shirt! The open back starts farther back than most, which is what I like. It’s also snug enough in the front that you don’t need to worry about a bra.