My son is 4, we ordered a child's small; which is supposed to be size 4-6. The feet hit him mid shin! We sent it back and ordered the medium(8-10). It is just verily big enough. So SIZE UP if you get this. I was also disappointed in the construction. The head is small and squashed, there were strings hanging, and the color is much lighter then what showed in the picture. My son wanted to be Scooby SO BAD and I bought the more expensive of the scooby outfits thinking it would be better quality...it's not! I would have sent it back if my son hadn't wanted to dress up as scooby so bad.