The ball, which was held last night in association with the jeweler Chopard at Elton John’s “house†in Windsor, England, benefited the Elton John AIDS Foundation. Gaga politely adhered to the dress code with a white latex jacket, white underwear, a pale-jeweled face mask, a white rubber headdress-cape, and a relatively demure white bucket hat and jacket. See the full outfits in the Lady Gaga Look Book.