Scarlett Johansson, in Marchesa, with Colin Jost at the Met Gala in New York, May 7, 2018. Thus begins the rehabilitation of Marchesa, the fairly or unfairly damned-by-association red carpet brand that was a casualty of the Harvey Weinstein horror story: with the Met Gala, a Vogue story and the support of the American fashion establishment. (Damon Winter/The New York Times)