Look, I am aware that a 31" chest measurement supposedly corresponds to a 36 band size, but just take my word for it yeah, I am definitely not a 36 - they just hang off me! The only way of finding a bra that truly fits is to try it on, measuring systems are - not to put too fine a point on it - rubbish: I have come out variously as a 36B, 36C, 32G, 34F using different methods. I mean for fuck's sake, do you really think I don't know my own bra size? If I owned a 36B bra I would take a photo of me wearing it - but it's sooo far from my size that I don't have any in my possession! Anyone with eyes can tell by looking at me that I'm not a B-cup. Jeez.