When their work first appeared, it was in the Eastern Jin Dynasty. At that time, people working in the Forbidden City in Beijing were required to wear a hat made of black gauze according to the rules. At that time, their work was only part of the work uniform and had no symbolic significance. Later, after a long time, this kind of hat spread to the people and people began to wear their black hats. Both scholars and vendors like to wear a hat made of black gauze on their heads. During the Northern and Southern Dynasties, with the rising price of raw materials and the improvement of production technology, black and white hats gradually became a luxury, which ordinary people could not afford, and only dignitaries and rich people could consume them.
In the Sui and Tang Dynasties, their work was adopted by the imperial court and became official clothes, including emperors, civil and military officials and literati. In addition, the rank of officials is distinguished by the number of decorative jade articles. There are 9 pieces of jade in the post of the first-level official, 5 pieces of jade in the official hat of the fifth-level official, and no jade in the official hat below the sixth level. Later, when the Song Dynasty was founded, in order to prevent ministers from whispering in court, Song Taizu added hat wings to their jobs. As long as the heads of ministers move, the wings of hats will vibrate, and Song Taizu can see who is talking underneath.
Their work officially began to symbolize official positions in the newly established Hongwu period of the Ming Dynasty. At that time, Zhu Yuanzhang issued an imperial edict: ordinary people are not allowed to wear professional clothes, and all civil and military officials should wear professional clothes at ordinary times and in court, but also wear belts and round neck official uniforms. Champion, flower picker and Jinshi who have achieved fame in previous scientific research can also wear their posts. Since then, their work has become a symbol of officials, clearly distinguishing officials from ordinary people. With the advancement of history, their work has also been integrated into our culture. Ordinary people say that people who lose their jobs lose their jobs.