The first Monday in May is here, which means fashion’s biggest night is upon us. That’s right, it’s time for the annual Met Gala, when the most stylish A-listers descend upon the steps of the Metropolitan Museum of Art in their sartorial best, showcasing looks that are often weeks—if not months—in the making. Those who scored a coveted invitation to the glamorous fête are expected to dress in theme with the corresponding exhibition at the Met, “Sleeping Beauties:........