XS    S   M   L XL
Waist 11.75" 12.75" 13.75" 14.75" 15.5"
Hip 18" 19" 20" 21" 22"
Rise 12.75" 13.25" 13.5" 14" 14.25"
Length 14.25" 14.5" 15" 15" 15.25"

*Model is 1.73m, UK 4/6 (Waist 12", Hips 17.25") and wears size S.

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

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