Sarah Jessica Parker made the potentially risky move of channeling “Funny Girl’’-era Barbra Streisand with a 1968 coiffure and lengthy lashes that would be the envy of Twiggy. But her butter cream Chanel silk dress kept the ensemble from turning into a Raquel Welch “Myra Breckinridge’’ costume. The dress will surely polarize fashion followers, but at least Parker was brave enough to step away from vampish gowns that often clog the red carpet.