I can't give you a bust measurement on this .. It has an open back. It just ties in the back. You can see it in picture 3. If I have to guess --According to Joe boxer chart it should fit 36 -40 but it won't fit DDD
I am 5 ' 4" big bobbed size 14 ..It doesn't look quite right on me. Use your judgement. I think someone who weighs no more then 145 or 150 could handle it