CPO (Chief Petty Officer) refers to a non-commissioned officer (equivalent to a sergeant first class in the army) and is a navy blue flannel shirt. It was worn around the time of World War I, and there are various variations. The color was changed from navy blue to black in the 1980s. Along with this, the fabric also changed from wool to a wool and polyester blend. Our product is made with thick wool 80% and nylon 20%. ■Color: Gray ■Size/Capacity 36(S)=Shoulder width 43cm Chest 49cm Length 67cm ■Materials: 80% Wool, 20% Nylon *Please note that shipping will take approximately one week.