For a while I've been trying to figure out how bust sizes are determined, but I think I've been looking in the wrong places. I've decided to take my quest to plastic surgeons, because they work in this field. Specifically those who do breast augmentation. How do breast augmentation surgeons (or anyone involved with breat augmentation) determine the cup sizes? If someone came in asking for a 36C cup augmentation, how would you know what it looked like? If someone came in with a picture of how they want them to look, would you be able to name it? EDIT: Romantic Angel, what I'm trying to figure out is, how do surgeons determine what the bra size is? Sure they can tell what a person's current bra size is, but if a person walks in with a 30AA and wants to be upgraded to a 36C, how do they know how big to make them? If someone comes in with a picture of how big they want their breasts to be, can they name what the size is? What is true the scale for breast augmentation? EDIT: Renee gives a good example, but I guess what I'm asking is, what is the exact difference between one size and the other? If a surgeon has both C and D sized implants, what is the exact measured difference between them? I know one is bigger than the other, I just want to know how thye're measured. How are you able to name one size of breast/implant? EDIT: AAnonymous Baby, are you saying that surgeons don't know the measured difference between breast sizes?