Size guide MEN'S SHIRTS Standard COLLAR (inches) COLLAR (cm) XXS/XS S S/M M M/L L L/XL XL XL/XXL XXL 14 14 ½ 15 15 ½ 15 ¾ 16 16 ½ 17 17 ½ 18 36 37 38 39 40 41 42 43 44 45 If the button-down does not fit on your screen, you can scroll to the right. * Please take a look that this is a guide only and the measurements can be different depends on the brand and style of clothes.