SHIRT MEASUREMENTS: (measurements are approximate) MEDIUM: COLLAR TO SEAM: 24 inch / 61 cm ARMPIT TO ARMPIT: 18.75 inch / 47.6 cm LARGE: COLLAR TO SEAM: 24.5 inch / 62.2 cm ARMPIT TO ARMPIT: 21.25 inch / 54 cm XL: COLLAR TO SEAM: 25 inch / 64.8 cm ARMPIT TO ARMPIT: 22 inch / 55.9 cm