One size equals Medium size. Size One size(Small/Medium) --Shoulder width: 16.5" Waist(G string):26.8"-36.2" Length:32.5" Size L --Shoulder width: 17.7" Waist(G string):28.3"-37.8" Length:33.2" Size XL --Shoulder width: 18.9" Waist(G string):30.7"-40.9" Length:34.1" Measured in different ways, if 1-2cm errors are reasonable