In 1948, Vogue published its 658-page Book of Etiquette, compiled by editor Millicent Fenwick, featuring how-tos, dos and don’ts, and the proper politesse for a remarkably varied set of scenarios. But as Fenwick writes in the introduction: “Etiquette is based on tradition, and yet it can change.” Some 75 years later, Oh, Behave! is a new monthly Vogue column in which experts sound off on today’s ever-evolving social etiquette.

Once upon a time, kingdoms literally legislated style. Medieval sumptuary laws dictated who could wear what—velvet for nobles, pearls for the pious, gold for the crown. Dress above your rank and you risked more than a side-eye; it was a punishable offense. These days, the only monarchs policing jewelry are your group chat and Instagram comments—but make no

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