I'm afraid that you regard the size as Euro Size and US Size.please do not follow system size chart !!!
<br />  if you want make a very correct choice you should choose by the size chart at the Second image !!!
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<br />>available:  S,M, L, XL, 
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<br />>ASIA SIZE Shoulder / Chest/ Length / Sleeve
<br />  S:51cm/116cm/78cm/64cm
<br />M:52cm/120cm/80cm/65cm
<br />L:53cm/124cm/82cm/66cm
<br />XL:54cm/128cm/84cm/67cm