Cover look 18: Dress, price upon request; select Dolce & Gabbana boutiques. 18K white gold earrings, $7,200; Sidney Garber, NYC. 18K white goldand-diamond bracelet, $22,000; davidyurman.com. Sterling-silver bracelet, $600; tiffany.com. Manicure, Maria Salandra. Tailor, Della George. V Life 40: Embellished-denim jacket, $795; coach.com. Tie-neck denim jacket, $329; Frame stores. 42: Coat, $598; ralphlauren.com. Sweater ($370) and jeans ($345). Sweater at pooleshopcharlotte.com. Jeans at shopbop.com. Turtleneck, $695; Chloé boutiques. Photographed in West Copake, New York. 44: Dress: Also at Capitol, Charlotte, NC. 46: Coat, $3,390; fendi.com. Shirt, $590; goldengoosedeluxebrand.com. Dress, $2,200; (800) 845-6790. Alexander McQueen choker, $1,290; alexandermcqueen.com. Falke knee-high socks, $24; falke.com. 52–53: On Koella: Clutch ($1,135), leather straps (priced upon request), gloves (price upon request), and boots ($1,945). Clutch at Barneys New York, NYC. Leather straps, gloves, and boots;…