The same height, chest circumference and waist circumference may be different. A, b and c are different from each other. Generally speaking, the difference of A is more than 8CM, that of B is 2-8CM, and that of C is less than 2 cm. For example, my height is 170, my bust is 88, and my waist is 78, so I should wear 170/88A. If my waistline is 88, I'll wear 170/88C (it's not that fat in China, so general manufacturers don't produce it), and the suit is the same, mainly to distinguish between fat and thin.