radical chic /radɪkl ˈʃiːk 
/ ▸ noun [mass noun] the fashionable affectation of radical left-wing views. ▪ the dress, lifestyle, or people associated with the fashionable affectation of radical left-wing views: the heyday of the hippie ethos and radical chic.
– ORIGIN 1970: coined by the US writer Tom Wolfe.
EnglishOxford Dictionary of English
