Peter Millar Mens Linen Button Up Shirt Size Medium Light Blue Casual Classic. Peter Millar men's button down shirt. Collared. Long sleeves with buttons at wrists. Single chest pocket. Light blue color. 100% linen fabric. Breathable. Size medium. Measured laying flat: measures 22.5" from armpit to armpit. Measures 33.25" from mid tag to end of sleeve. Measures 28.5" long from bottom of mid collar to hem.