《南史·列传·卷四十二》
根据宋朝元嘉时期的制度，诸王进入斋阁，可以穿戴白色衣帽拜见君主，只有出了太极殿的四面厢房，才改穿朝服。
宋元嘉制，诸王入斋合，得白服裙帽见人主，唯出太极四厢，乃备朝衣。
According to the system in place during the Yuanjia era of the Song dynasty, when imperial princes entered the inner palace, they could wear white hat and robes to meet with the emperor, and only after they had exited the four annexes of the Taiji palace were they required to change into court robes.