Material: Wool Closure: Button Collar: Wide collar Color: Gray Pattern: Solid Season: Autumn/Winter Hood: No hood C.P.O. stands for Chief Petty Officer, equivalent to a First Sergeant in the army, and it's a flannel jacket. It was worn around the time of World War I, and there are various styles. The price is gradually increasing. Size: Shoulder width: 52 cm Body width: 50 cm Length: 80 cm Sleeve length: 63 cm