It is US size.It is man size,but man and women both can wear it. 
<br />BOY/Straight waist design:            B at the beginning
<br />Size S:  Chest breadth:47cm    clothes length:64cm
<br />Size M:  Chest breadth:49cm    clothes length:66cm
<br />Size L:   Chest breadth:52cm    clothes length:68cm
<br />Size XL:   Chest breadth:54cm    clothes length:70cm
<br />Size XXL:   Chest breadth:57cm    clothes length:72cm
<br />Size XXXL:   Chest breadth:59cm    clothes length:74cm
<br />GIRL/Waist design:         G at the beginning
<br />Size M:  Chest breadth:42cm    clothes length:57cm
<br />Size L:   Chest breadth:44cm    clothes length:58cm
<br />Size XL:   Chest breadth:46cm    clothes length:60cm
<br />Note:
<br />Please compare above detailed size with your measurement before purchase.
<br />Please allow 1-2cm differs due to manual measurement.
<br />Due to the difference between  different monitors,the picture may not reflet the actual color of the item.
<br />We guarantee the style is the same as shown in the picture,but not the same performance on different bodies as on the model.