The humble sweater vest has had one hell of a decade. In the early 2010s, the knitwear staple was all but left for dead, the sort of fuddy-duddy sartorial relic only your grandpa could love. And then ...

According to stars, sweater vests are back for fall. We asked a celeb stylist how to make the collegiate trend feel modern, with pro shopping tips and layering tricks—like how to avoid looking bulky.

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