The size "M" in centimeters from shoulder to shoulder = 46 cm 
and the width in centimeters from armpit to armpit = 51 cm
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The size "L" in centimeters from shoulder to shoulder = 50 cm 
and the width in centimeters from armpit to armpit = 55 cm
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The size "XL" in centimeters from shoulder to shoulder = 54 cm
and the width in centimeters from armpit to armpit = 58 cm