According to the clothing code in the Yoro Ritsuryo Code, formal clothing during the Nara period was worn to attend important religious services, the Imperial Enthronement Ritual called Daijosai or Ooname no matsuri, and on New Year's Day.
養老律令の衣服令によると、奈良時代の礼服は、重要な祭祀、大嘗祭（おおなめのまつり、だいじょうさい）、元旦のときに着る服である。