a size three hooded vest found at the thrift store. Just happened to be a perfect fit. ALl i needed to do was zigzag a strip and cut a slot about 2 inches in the arm to give him more room. It was an easy fix. The hood however made for a fun game of blind man's bluff but it really wasn't safe so i tucked a few stitches and secured it down. Total cost, 6 dollars.