Men's Measurements ALPHA SIZE S M L XL 2XL 3XL Chest Size 34½-38 38½-42 42½-46 46½-50 50½-53 53½-56 Sleeve - RG 34¼ 34¼ 35¼ 35¼ 36¼ 36¼ Sleeve - LN 35¾ 36¼ 36¾ 37¼ 37¾ 38¼ Sleeve - XLN 37¼ 37¾ 38¼ 38¾ 39¼ 39¾ Back Length RG Regular Back Length LN Plus "1½" XLN Plus "4"