A lot of women are wearing the wrong bra size because they do not know how to accurately measure themselves. If your bras leave red marks or are just plain uncomfortable, chances are you’re wearing the wrong size. Spillage over your cups or back strap or spaces between your cups are also a good sign. It is so essential for a woman to know how to choose the correct bra size.Knowing how to measure your bra size is the first step in finding the perfect bra. Bra sizes do vary among brands. Finding the perfect bra takes time and patience, but will be worth all of your effort in the end.