Mary felt annoyed at the girl; just because bras had become passé, did a girl with so pronounced a bosom have to cater to fashion? In this case practicality dictated a bra, and Mary stood at the desk feeling herself flushing with disapproval.
Source: wiktionary
I never thought you'd be a junkie, because heroin is so passé.
Source: wiktionary
We'll paint the town blue 'cause, baby, red is so passé.
Source: wiktionary
It is perhaps inevitable that a movement that was the height of fashion in the last decade would start to seem passé in this one. That’s how style works; the young and innovative distinguish themselves by breaking with the conventions of their predecessors.