1. Zombie theory prevailed after the middle of Ming and Qing Dynasties, and most of it was recorded in Qing Dynasty. 2. Zombies wearing clean clothes are not all zombies wearing clean clothes in early Hong Kong movies, but preconceived ideas are at work. Clean clothes are weirder than clothes in other dynasties and jump much more stiffly, so they are most suitable for shooting zombies. The clothes of other dynasties are so elegant that they feel stiff like zombies. Another point is that the Qing Dynasty in China was the most insulted by foreigners, and the government was also the most incompetent, so zombies are now officials at that time.