It is said that the direct origin of Japanese Court caps was a headgear called 'tokin' (hood), which was a part of chofuku (clothes worn by the nobility when attending Court), and this headgear is seen in the Ibuku Ryo (Garment Code) of the Yoro Ritsuryo Code.
日本の冠の直接の祖先は、養老律令の衣服令（いぶくりょう）に見える朝服の被り物「頭巾（ときん）」であるとされる。