Social class might play a part too. The peasants at the top aren’t wearing much, but the pharaoh seems dressed up;
There is no pharaoh in the pictures.
In the top picture, the man to whom the tomb belongs is the guy who is seated wearing a kind of light, see-through top. He also seems to have a blonde wig (?) a bit unusual I'd say. I don't know where this picture came from.
In the bottom picture, the tomb owner is the bald guy on top, who together with his wife, is giving offerings to Osiris, who is the black (the colour of death) painted seated guy. Osiris is dressed as a pharoah because he's king of the underworld. The bald guy has more jewellery and a more elaborate skirt but is otherwise similarly dressed as the servants.
