No matter what remains of the city, they are superstitious white.
Why is it white? Because people from hell only recognize this color, which is good for people's souls. White clothes, no one wears uniform white, let alone wedding dresses, because there are celebrations, fireworks, or other red colors that people from hell don't recognize.
In addition to a white quilt, the dead old man might as well wear cotton shoes, which is old-fashioned and convenient for going to hell.