Why do people wear Qing Dynasty clothes when they die?

You mean wearing the official clothes of the Qing Dynasty. It seems that all the zombies in the movie are wearing the official uniforms of the Qing Dynasty, because the official uniforms of the Qing Dynasty are relatively straight and dark. The appearance of official hats makes the whole dress different from Hanfu, which has a depressing taste and is more in line with the image of zombies from the shooting effect. It is not impossible to shoot with costumes from Tang Dynasty, Ming Dynasty and Han Dynasty, but because the color of Hanfu may be lighter (such as white) and wider, it is not appropriate to shoot zombies as official clothes, but there will be a kind of elegant fairy spirit in it. Therefore, shooting beautiful female ghosts usually wears ancient Hanfu.