Why did ancient Koreans wear white clothes?

Koreans love cleanliness and wear white clothes, saying that white symbolizes cleanliness and purity. Even weddings, funerals, weddings and festivals are not given red envelopes here, but white ones. In ancient times, whenever a great man in the court died, the court ordered people to dress him in white clothes and linen, Dai Xiao. But for a while, the big shots in South Korea always hung up. (It's a tragedy) Ordinary people had to wear white clothes all the time. Later, it became a custom.