The Siphoning of street style by society’s more gilded tiers is a longstanding trick of the trade in fashion. Marie Antoinette dressed as a “sheep herder” to alleviate ennui, Vivienne Westwood commoditized the defiant plumage of her punk contemporaries, and Marc Jacobs famously put flannel-the sartorial emblem of “anti-fashion” on the runway. But there is…