Most women spend 16 hours per day in their bra. It is important to your long term health that it fits you properly, both in the band and the cup size. A bra that is too tight may cause tension on your shoulders, neck and back which can lead to headaches. A cup too small may dig into the tissue causing damage. Wearing a bra that is too loose does little good if it floats on your breasts allowing too much motion which can lead to pain and potential long terms damage to the breast tissue. A lingerie specialist can get you sized properly. It’s free and worth the trouble. You need to feel comfortable and look good in your bra.