S  M L
PTP 15.5" 16.5" 17.5"
Waist  13" 14" 15"
Length 14" 14" 14"

*Model is 1.70m, UK 4/6 (PTP15", Waist 11.5") and wears size S.

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

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