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:S,M,L,XL
>(PANTS SIZE) Waist /Length/ Hip / chest
S: 65cm/ 136cm/ 76cm/ 76cm
M: 69cm/ 137cm/ 80cm/ 80cm
L: 73cm/ 138cm/ 84cm/ 84cm
XL: 77cm/ 139cm/ 88cm/ 88cm

Note:
1.Due to the difference between different monitors,the picture may no