This looks hardly worn if at all. Just wrinkled from storage. Could also be an adult S.
The only issue I see is under the armpit where it looks like the fabric has separated, but there isn’t a hole. I have shown a picture. The other armpit doesn’t match that so I am assuming it could just be sewn closed.
Sold as is.
Pit to pit flat; approx 18 inches
Length: approx 24 inches long