The sizing for these are quite a bit off, the L/XL swallowed me i am a size 10 adult. The S/M is still a size too big but doable with a shirt underneath. We even tried going as small as a childs L/XL but that is too small for an adult to wear. Other than the sizing issue, the length of the sleeves and the ease of getting the top on and off for fast costume changes it's great.