Pls ignore Amazon Size Chart and refer to our size chart below: S: US34, M: US36, L: US38, XL: US40, XXL:US42, 3XL: US44 You also can use flat measurements to get your fit size, refer to the ways on the pic below: Chest width S: 38'', M: 40'', L: 42'', XL: 44'', XXL:46'', 3XL: 48'' 65% Cotton 35% Polyester. Tailored for a flattering fit and elongated silhouette, 4 sets of copper coloured button fastenings to the front, double breasted with classic notched lapels.