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，2XL，3XL，4XL，5XL

>ASIA SIZE Shoulder / Chest / Length / Sleeve

M: 44.5cm/ 104cm/ 62.5cm/ 62.5cm
L: 46cm/ 106cm/ 64.5cm/ 64cm
XL: 47.5cm/ 112cm/ 66.5cm/ 65.5cm
2XL: 49cm/ 116cm/ 68.5cm/ 67cm
3XL: 50.5cm/ 120cm/ 70.5cm/ 68.5cm
4XL: 52cm/ 124cm/ 72.5cm/ 70cm
5XL 53.5cm/ 128cm/ 74.5cm/ 71.5cm