《礼记·杂记上》
大夫的妻子死了，已经过了卒哭，改戴较轻的葛纽，这时又遇到小功以下的兄弟去世，大夫前去吊孝也要改作头戴弃纽。
大夫有私丧之葛，则于其兄弟之轻丧，则弁绖。
When a high-ranking official's wife died, after the initial mourning period, he would change to a lighter gé niǔ hat. If a brother of lower rank died during this time, the official would also change to wearing a qì niǔ hat when offering condolences.