It’s the first Monday in May and you know what that means: it’s fashion’s biggest night out. The Met Gala, an annual fund-raising benefit for the Metropolitan Museum of Art, showcases the pinnacle of themed haute couture on its red carpet each year. From opulent to outlandish, notable figures and the Hollywood elite dress to impress — or at least make a splash. Last year’s unforgettable looks included Kim Kardashian controversially donning Marilyn Monroe’s glittering 1962 garment and Blake Lively’s ode to Lady Liberty in a dazzling copper and — after its unraveling — oxidized green gown. Alongside Anna Wintour,...