Refinery 29 – After months of rumors and conspiracy theories about everything from the guest list to the celebrities’ outfits, fashion fans are finally feasting on the lavish display of costume and style that’s the Met Gala. This year, both the party, which raises funds for the Metropolitan Museum’s Costume Institute, and the exhibition — opening May 5 — honor the late designer Karl Lagerfeld, who’s credited with reviving the houses of Patou, Chloé, Fendi, Balmain…