Woolrich - Buffalo Check style for those who prefer to wear cotton Catalog & Woolrich.com Exclusive Our wool Buffalo Check Shirt is legendary. A reputation well deserved for keeping outdoor enthusiasts warm for over a century and a half. But many customers wanted the familiar Buffalo Check look in a cotton shirt. And here it is. The classic Buffalo Check in heavyweight cotton flannel. This plush 7-ounce flannel has all the panache of its wool predecessor in a shirt that can be worn next to the skin all day in complete comfort. Double-ply back yoke. Two front pockets with button-through flaps. Imported. Machine wash.