The difference between D cup, bust and lower bust is17.5cm..
A cup, B cup, C cup ... refers to the size of the cup, corresponding to the size of the breast.
So the breasts of D cups are bigger than those of A cups.
Extended data
The word "cup" was defined by the French. Because the bra was invented by the French in the 1920s, its original name was corset. Bra is abbreviated as bra, which comes from French. When the French invented the bra, they also determined the unit of breast or the breast size derived from it.
The word "cup" is translated quite vividly by China people, because apart from the belt, there are only two cups that cover the breast, and it is easy to understand to measure the size of the breast by the size of the cup. Experts suggest that if you want to achieve the ideal cup, you can choose exercise breast enhancement.
Bra cup is the main body of bra, which plays an important role in breast protection, shaping, breast augmentation and breast beauty.
The size of a cup depends on its depth. The bust at the highest point of the breast (one of the three measured values) MINUS the length of the next week of the breast is the cup. The size between two cups is measured by a long enough back buckle.
Baidu encyclopedia-cup