Originally from Ying Zheng in Qin Dynasty, he believed in black. Ying Zheng thinks black is a noble color, and Ying Zheng is a person who likes to watch Feng Shui. Someone told him that the attribute of Qin Dynasty was water, and the corresponding attribute of black was water, so Ying Zheng thought that black would complement his rule, so his clothes were all black. This habit didn't change until Liu Heng became a monarch.
When Liu Heng was in power, he gave up black as the representative color of sovereign power, and began to wear bright yellow clothes, and embroidered dragon patterns on them. In ancient times, people thought the dragon was an auspicious and noble beast, so only the monarch could decorate clothes with dragon patterns. Since Liu Heng, Emperor of China, emperors of all dynasties have continued the habit of wearing yellow robes, which is impossible for ordinary people to wear.
Tang Gaozu once told the world that you can't wear yellow clothes. He also said in particular that yellow is the color of the monarch and the representative of the monarch. This move makes it more clear that yellow is a symbol of sovereign power. If someone wears bright yellow clothes or robes, they are rebellious and will be punished and beheaded. There are also rumors that during the Yongzheng period, Nian Gengyao boldly put on the yellow jacket given to him by Yongzheng, which accelerated the process of his death. What should people do now when they talk about history? Yellow robe plus body? That is, this man became a monarch.