フランス語のfac(する)が語源で、語源的にはface(顔)、fact(事実)。後にファッション、流行を指す言葉として使われるようになった。
To call a fashion wearable is the kiss of death. No new fashion worth its salt is wearable. [Eugenia Sheppard, "New York Herald Tribune," Jan. 13, 1960]In Middle English also spelled faschyoun, facune, faction, etc. Fashion plate (1851) originally was "full-page picture in a popular magazine showing the prevailing or latest style of dress," in reference to the typographic plate from which it was printed. Transferred sense of "well-dressed person" had emerged by 1920s. After a fashion "to a certain extent" is from 1530s. Shakespeare (c. 1600) has both in fashion and out of fashion.