Chamois is like flannel's softer cousin. Brushed for comfort but lightweight enough to wear as a shirt or overshirt. Details that make a difference: - Heathered yarns - Corozo buttons - Can be worn as a shirt or overshirt - Fits true to size - Idris is 6'1" and wearing a size medium - Chest cirumference: 48.5" - Shoulder width: 20" - Sleeve length: 34.75" - Length: 30" - 100% chamois cotton