《周礼·天官冢宰·典妇功&夏采》
凡举行祭祀、招待宾客，供给王后应穿的衣服，以及九嫔、世妇，凡内外命妇，都供给所应穿的衣服。供给丧服也这样。
凡祭祀、宾客，共后之衣服，及九嫔世妇。凡命妇，共其衣服，共丧衰，亦如之。
Whether it is for holding a ceremony or receiving guests, provide necessary clothing for the queen and all her ladies-in-waiting, including the nine concubines and their wives. The same rule applies to outfits for mourning.