The Wills Wool Overshirt traces its roots to the original U.S. Navy CPO shirt, a top layer designed to help keep sailors warm on cold decks. Ours balances heritage-inspired details with refined upgrades, resulting in a shirt made with a warm wool-blend that’s woven in a herringbone pattern, a subtle design choice that gives the shirt character. A structured collar, two front chest flap pockets, and a back yoke give it added function and make it easier to wear—whether that’s buttoned up and paired with a trouser, or left open with a tee and dark wash denim.