Belly Button Maternity Band Small-pant size 2-4 (26-27 ), Medium size 6-8 (28-29), Large size 10-12 (30-31), X-Large size 14-16 (32-33) The Belly Button attaches to almost any pair of unbuttoned pants. Simply button your pants to the inside of the Belly Button using its patented button to add inches to the waist of your favorite pants. The Belly Button conceals your unbuttoned pants and gives you a layered look.