A dramatic plunging neckline and a delicate pleated skirt go hand in hand in this ivory chiffon empire- waist gown, $1,249, by Alfred Angelo Sapphire, 866-826-4356. Lucite bubble bracelet, $503, by Erickson Beamon, 212-643-4810. Platinum and diamond engagement ring, $2,150 (without center stone); matching band, $1,375, by Jeff Cooper. On him: White dinner jacket, $798; black tuxedo pants, $200; bow tie, $45, all by Brooks Brothers. Shirt, $180, by Thomas Pink. Glasses, $365, by Robert Marc.