WHILE THE WORLD HAS BEEN caught up in a flurry of HOLIDAY festivities, on Wednesday in on Madison Avenue, New York, the Valentino Sala Bianca Haute Couture quietly unfolded. While the regularly scheduled Spring 2015 Couture collection will be presented according to plan in Paris in January, this show was a celebration of “the original Valentino’s early, ’60s-era collections at the Sala Bianca in Florence and the Sfilata Bianca in Rome that were comprised of looks all in white … debuting light-as-air dresses and gowns of white chiffon, white lace, and white plissé organza” . . .