"HOW TO MEASURE THE POUCH SIZE: Measure the desired cup size of the pouch (the outward curve). Lie down on the bed or the floor, and flaccid, measure from the left leg crease, across the ""package,"" to the other leg crease. That is your pouch WIDTH. Divide that by 2 for your pouch size. Standard pouch cup size is 2 inches (5.1 cm)."