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/  100cm/    68cm/  60cm
<br />    S:        45cm/  104cm/    70cm/  62cm
<br />    M:       47cm/  108cm/    72cm/  64cm
<br />    L:      50cm/  112cm/    74cm/  66cm
<br />   XL:     52cm/  116cm/    76cm/  68cm