Model is wearing SIZE S.

Size XS,
15" across, 16" hips, 32" length. Fits UK 4-6.

Size S,
16" across, 17" hips, 32.5" length. Fits UK 6-8.

 

Size M,

 17" across, 18" hips, 33" length. Fits UK 8-10.

 

Size L,

 18" across, 19" hips, 33.5" length. Fits UK 10-12.