I'm afraid that you regard the size as Euro Size and US Size.please do not follow system size chart !!!
if you want make a very correct choice you should choose by the size chart at the Second image !!!

>available: M, L, XL
>(PANTS SIZE) Waist/Length/ Hip
M: 68cm/ 20cm/ /
L: 72cm/ 21cm/ /
XL: 76cm/ 22cm/ /