Of persons: Observant of or following the fashion; dressing or behaving in conformity with the standard of elegance current in upper-class society.

? Subject to the sway of fashion.

Of a person: attentive to or following the mode or latest fashion or style. (Sometimes with disparaging implication.)

Fashionable, modish.

colloquial. Showing awareness of what is fashionable, esp. in matters of dress; stylish, smart, chic. Now rare or merged in sense 4a.

Characteristic of or suitable for downtown, esp. in being smart, sophisticated, or metropolitan.

colloquial (originally U.S.). Attractively shrewd or clever; sophisticated, stylish, classy; fashionable, up to date; sexually attractive.

switched-on: aware of all that is considered fashionable and up to date. Cf. turned-on adj. at turned, adj. compounds. Less frequently, in contrast, s…

Trendy; self-consciously or extravagantly fashionable.

slang (originally U.S., esp. in African-American usage). New and exciting; fashionable; good, excellent; cool.

= cool, adj. 8.