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In 1928, Hermès designer Robert Dumas created the sac à dépêches or dispatch bag—a purse with a functional aesthetic that deviated from the ornamental fashions of the time. That idea informed the trapezoidal Kelly bag, which was popular even before it was nicknamed after the sexily patrician actress Grace Kelly (“To Catch a Thief”) in the mid-1950s: Women found its easy-to-grip top handle and roomy interior both practical and chic.

“Larger handbags came into fashion in the ’50s,” said Kristina Haugland, the Philadelphia…