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: XS, S, M, L, XL, 
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<br />>ASIA SIZE Shoulder / Chest/ Length / Sleeve
<br />   XS:         43cm/  104cm/    64cm/  61cm
<br />    S:        44cm/  108cm/    66cm/  62cm
<br />    M:        45cm/  112cm/    68cm/  63cm
<br />    L:        46cm/ 116cm/    70cm/  64cm
<br />   XL:       47cm/ 120cm/    72cm/  65cm
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