3 buttons are sewn here but hidden under a cloth piece. Sleeves on it are 20inches long and 6inches wide at the cuff. One button is sewn on each cuff, nightwing costume with a split that’s 6inches long. Mazzuca, Anthony (August 9, 2020). “One Piece: 10 Weird Facts You Never Knew About Robin”. Be sure to check the size chart before purchasing, as sizes vary from product to product. 2. Coat: also made from cotton, it carries wonderful accuracy level in each detail.