On her: Evening coat, $2,600, hot pants, $960, and shirt, $720, Katie Ermilio, available at Halls. Pumps, $450, Isa Tapia, Saks Fifth Avenue. Pearl earrings, $150, Elle, available at Greenwich Jewelers. Ring, from $1,590, Hearts on Fire.
On him: Suit, $995, tie, $95, and belt, $125, Hugo Boss. Shirt, $230, Kitsuné.
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