Size guide MEN'S SHIRTS Standard COLLAR (inches) COLLAR (cm) XS S M L XL XXXL 4XL 14 14 ½ 15 15 ½ 16 16 ½ 17 17 ½ 18 18 ½ 36 37 38 39 40 41 42 43 44 45 Side Zip V-Neck Sweater. * Please take a look that this is a guide only and the measurements can be different depends on the brand and style of clothes.