The evening marked the rare overlap of high-wattage designer fashion and Beltway power. Vice President Harris, who always looks polished if not overly interested in clothes, wore a sequined column gown by Celine, the French luxury label designed by Hedi Slimane. Jost, host of the evening’s proceedings, wore a satin-trimmed navy tuxedo by Giorgio Armani, while his wife, the actress Johansson, wore a dress by Armani’s couture label, Privé.

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