Hello! The word cup was determined by the French. Because the bra was invented by the French in the 1920s, its previous name was Corset. Bra is simply called bra, and this word comes from French. When the French invented the bra, they also determined the unit of breast or breast size derived from it. The word "cup" is translated quite vividly by Chinese people, because in addition to the straps, a bra only has two cups that cover the chest. The size of the breast is measured by the size of the cup, which is simple and easy to understand.