That dress was one in a series of departures from the vaunted midcentury throwback, the trumpet-skirted mermaid gown. Claire Foy, who had been nominated as the lead actress in a drama series for her role in the Netflix series “The Crown,” wore a crystal-trimmed black Oscar de la Renta jumpsuit, racy in its sleekness. It was topped for sheer nerve by Evan Rachel Wood’s riskier, if more memorable, choice: a white dinner jacket, bustier top and tails whipped up for the HBO “Westworld” best actress nominee by Jeremy Scott of Moschino.