As the 'Dairi koban' (night guard in the Imperial Court) system was established in the early-modern times, noshi (everyday clothes for nobles) and ikan became common as daily work clothes other than ceremonies.
近世に宮中の宿直である「内裏小番」の制度が確立すると、儀式以外の日常の勤務服として直衣・衣冠が一般化した。