Ralph Lauren Black Label Shirts - Mother of Pearl Buttons, Made by Lorenzini. Size Large, RLBL shirts fit slim, may work for medium, see measurements. Photos: Spoiler: Warning: Spoiler! Spoiler: Warning: Spoiler! Measurements: Armpit to armpit: 20" Shoulder to shoulder: 17.5" Length (from back of the collar): 31.5" Sleeve length (shoulder seam to end of cuff): 27"