Fashion, in and of itself, as a form of social life, is a preeminent case of this correlation. The adornment and accentuation that it lends to the personality is accorded to it only as the member of a class that is collectively distinguishing itself from other classes by adopting the new fashion. (As soon as a fashion has diffused into the other classes, it is abandoned and replaced with another.) The adoption of a fashion represents an internal leveling of the class and its self-exaltation above all other classes.

DEFINE: Explains the mechanism by which fashion functions as a marker of class status, where diffusion into other classes triggers abandonment.

Georg Simmel, on individuality and social…, loc. 618