For carefree elegance that lets you move, choose a flowing dress and flats, and tell him to forget the tie. Antique-white satin-georgette gown, $575, by Nicole Miller. Lucite-and-silver-plated necklaces, $175–$200, both by Isaac Manevitz for Ben-Amun, 212-944-6480. Lucite cuffs, $300 each; ring, $240, all by Patricia Von Musulin, 800-243-5596. On him: Grey silk suit, $2,200; silk pocket square, $85, both by Ermenegildo Zegna. White shirt, $165, by Hickey Freeman. Sterling silver necklace, $600, by David Yurman. Brown suede loafers, $540,by Cesare Paciotti.