XS    S   M   L
Waist 11.5" 12.25" 13.5" 14.5"
Hip 16.5" 17" 18" 19"
Rise 12" 12.5" 13" 13.5"
Length 11.5" 11.75" 12" 12.5"

*Model is 1.70m, UK 4/6 (Waist 11.5", Hips 16.5") and wears size XS.

If you are in between size for waist, it is best recommended to size up. 

*In between sizes refers to your measurements falling between 2 sizes, example size S & M.