Which theory of fashion adoption suggests that fashion moves horizontally among social classes rather than vertically?

The theory of fashion adoption that suggests fashion moves horizontally among social classes rather than vertically would be the horizontal-flow theory. Also known as the mass-market theory. 

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art.