G-SIZE3

 Size Age 1/2 Waist(in) Length(in)
S 8-10 10.2 10.6
M 10-12 11.0 11.0
L 12-14 11.8 11.4
XL 14-16 12.6 11.8

The sizes are manually measured with error from 0.2 to 0.8 inches.