A bra is useful because it protects your breasts from the traction of gravity and sagging. A bra is designed to hold the gravity of your breasts, not to lift them and bind and restrict them. It prevents excessive swaying of the breasts when you exercise, which can lead to minor damage to the breast tissue. A good bra should be able to firmly support the lower part of the breasts and allow the skin on the lower part of the breasts to relax, while limiting the downward movement of the breasts. A bra should be able to correct breast deficiencies. A good bra should not lift the breast, nor should it separate or gather both breasts. If your bra leaves marks on your skin and these marks do not disappear 20 minutes after you take it off, then your bra is not right for you; it is too small. In fact, more than half of all women, wear bras that don’t fit them. When buying lingerie, some of the big brands have lingerie guides who have this knowledge. Even if you are not going to buy that expensive lingerie, be bold and ask her for advice, she will be happy to serve you.