(1) Avoid ordinary people wearing expensive clothes.
The so-called "expensive color" is the color that represents noble status. In the eyes of China people, expensive colors are yellow, purple and other colors. In feudal society, these expensive colors are the exclusive colors of the royal family or powerful people, and it is against the taboo for ordinary people to wear these colors.
In the past, royalty, princes and other nobles were likely to change their favorite colors according to their own whim. The color they often use for their clothes has become their exclusive color, but it has become a forbidden color for ordinary people. The taboo on expensive colors is mainly aimed at working people living at the bottom of society.
(2) Avoid cheap colors
The so-called cheap color is the color that represents humble status. People think that green, blue and cyan are cheap colors, and only prostitutes, actresses and other "cheap" people use these colors to make clothes. Among these colors, people are mainly sensitive to green. Yan Shigu, a Confucian in the Tang Dynasty, said, "A woman in green is a woman's dress." Blue and cyan are green cousins, so they are also implicated to some extent.
In the Han Dynasty, people were more ashamed to wear green clothes.