《宋书·志·卷十八》
武冠插貂尾，起初为趟武灵王仿效胡服而制，后来袭用，为武官或侍从近臣所戴；帧本为卑贱而不能戴冠者覆髻之巾，后来皇帝大臣也纷纷戴帧，一旦合于时俗，便风行成为后代遵循的制度。
夫边貂假幸侍之首，贱帻登尊极之颜，一适时用，便隆后制。
Military caps are inlaid with sables. The cap was first created by King Wuling of Zhao who was imitating the clothing of the Hu people. It was used later on by military officials or attendants and close officials; Zhen was originally a type of kerchief that was used to cover the hair of people who were too humble to wear a hat. Later on, the emperor and the officials also wore zhen, and once it became fashionable, it was adopted as a custom that was followed by later generations.