Bra Cup Sizes – Wear a bra that does not fit properly can cause posture problems, back pain and discomfort, but polls show that many women wear the wrong bra size regularly. Determine the right bra cup size for you is a simple procedure that can be done at home or by a clerk trained sales. To measure cup size bra, you need a meter of a sewing kit and some ‘basic math. It will take two measures, and when to take these measures, you should wear fitting bra currently own. Should not be a minimizer bra or sports bra, as this will result in measures that are smaller than your actual size, it should not be a padded bra or push-up bra, as this will lead to larger sizes than your actual size. The measures tend to be more accurate when taken by someone else, so try to get a friend to help you.