S   M   L
Waist 12.5" 13.5" 14.5"
Hip 18" 19" 20"
Length 29" 29.5" 30"

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

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

If you are in between size for waist, you can choose to size down if you would like to wear it higher-waist, otherwise you can size down to wear it lower-waist.

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