Bra sizes we stated that fit each breast form do not meant it is exactly the size for each individual, it is a general guidelines. For example, if you want to achieve size 36B, it do not mean you pick size A cup breast form. one person wearing size A Cup can be a cup B but the other person cup A. if you have questions on finding the best fit product please tell us what is your height, weight, chest size and also result you want to achieve so we can find you the best fit product. Exchange is acceptable but please note !!! if you are not sure that is the right fit for you once you get the product, please try it on without peeling off the plastic sheet at the back of the breast form. once the plastic sheet is remove and stick to your chest it will get stain, body hair and we will no longer able to take it back for return or exchange.