Creepy Clown Girl Costume - Child Size X-Large

What's the average age the size xl usually fit? My daughter is not an average 11 yr old

What are the size chart measurements for the xl? my daughter normally wears a l (10/12) but the l is sold out.

What are the sizes? My daughter is 10 years old and wears size 12 or 13 which one should I buy?

What size would I order for my daughter? that wear 8-10