Pierre Berg?????s private dinner for the opening of the massive Yves Saint Laurent retrospective at the Petit Palais Tuesday was a who???s-who of a certain fashion era and drew designers including Jean Paul Gaultier, Sonia Rykiel, Kenzo Takada, Valentino, Alber Elbaz and Berg?????s current favorite, Riccardo Tisci of Givenchy, whose show Berg?? attended earlier in the week.