This is the uniform dress our players wear on court.
Basic sizing guide
Kids sizing in line with typical store sizing
XXS typical store size 6
XS typical store size 8
S typical store size 10
M typical store size 12
L typical store size 14
XL typical store size 16
XXL typical store size 18 
3XL typical store size 20
4XL typical store size 22
5XL typical store size 24+