Goodbye, Gingham. Hello, Billows.
Was it only a couple of years ago that Gwyneth Paltrow sauntered up the grand staircase at the Metropolitan Museum of Art’s annual costume extravaganza, swaths of skin on show, curves encased in a slick one-shoulder gown? On her return visit to the Met gala last month, Ms. Paltrow ditched that patently steamy look for…