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 !!!
<br />
<br />>available: XS,S, M, L, XL, XXL,XXXL,XXXXL
<br />
<br />> SIZE       Shoulder / Chest/ Length / Sleeve
<br />   XS:           39cm/  92cm/    64cm/  58cm
<br />    S:          41cm/  96cm/    65cm/  59cm
<br />    M:         43cm/ 100cm/    66cm/  60cm
<br />    L:        45cm/ 104cm/    67cm/  61cm
<br />   XL:       47cm/ 108cm/    68cm/  62cm
<br />  XXL:      49cm/ 112cm/    69cm/  63cm
<br /> XXXL:     51cm/ 116cm/    70cm/  64cm
<br />XXXXL:    53cm/ 120cm/    71cm/  65cm