According to the definitions of "the Garment Code" in "Yoro ritsuryo code (code promulgated in the Yoro period)" in the Nara Period, ho (outer robe/vestment) of civil officers' chofuku was called "Koromo" while ho of military officers' chofuku was called "Fusuma."
奈良時代の『養老律令』の「衣服令」が定めるところによると、文官の朝服の袍が「衣」と呼ばれるのに対し、武官の朝服の袍は「襖」と呼ばれた。