SIZE21

 Size Hip(in) Dress(in) Length(in)
S 33-35 2-4 15.0
M 36-38 6-8 15.5
L 39-41 10-12 15.9
XL 42-44 14-16 16.5
2XL 45-47 18-20 16.9
3XL 48-50 20-22 17.4

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