shako n.

also chako, cylindrical soldier's headdress with plume or pompon, 1815, from Hungarian csákó, short for csákós süveg "peaked cap," from adjectival form of csákó "peak, projecting point of a cow's horn," which some European etymologists derive from German zacken "point, spike," but which Hungarian sources regard as of unknown origin. Worn by infantry soldiers in 18c.-19c.