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They’re here, they’re there, they’re everywhere. As designers increasingly cater to more casual lifestyles, the puffer jacket — the ultimate form-follows-function piece — went from mere utilitarian staple to major fashion statement on fall runways. It’s being offered in a variety of versions, from Adam Selman’s hugely oversize denim take to Burberry’s fur-trimmed number. So now, when the cold winds blow, those donning puffers can feel warm — and look cool.