in fashion popular, trendy (Brit. informal), all the rage, hip (slang), in (informal), latest, the new, happening (informal), current, modern, cool (slang), with it (informal), usual, smart, prevailing, fashionable, stylish, chic, up-to-date, customary, genteel, in vogue, up-to-the-minute, modish, du jour (French), à la mode, voguish (informal), trendsetting, all the go (informal), culty That sort of dress is in fashion again.
fashion, style, and fad mean the way that up-to-date people do things. fashion is used of any custom (as a way of dressing or behaving) that is widely accepted at any one time or place. It was once the fashion for everyone to wear hats. style may suggest a fashion that is approved of by people with taste. The house was decorated in the latest style. fad is used for something that is very popular and often only for a short time. Beach tennis may be just a fad.