How to dress for the office this spring and still be ready for post-work cocktails: a blend of loose, airy white pants, a structured denim jacket (a collarless neckline, three-quarter-length sleeves and bolero fit keep it from feeling too casual), a mixed-media necklace, and a pair of strappy sandals (they look sleek beneath a pant cuff, but give just a hint of sexiness when your legs are crossed). Here’s where to get the look: Citizens of Humanity Thalia jacket, $468 at Third Street Habit, Old City. Lizzie Fortunato ‘Fast Lane’ necklace, $495 at Peter Kate, Greenville. 10 Crosby Derek Lam white trousers, $395 at Intermix, Rittenhouse. Stuart Weitzman ‘Ria’ pumps, $498 at Stuart Weitzman, Rittenhouse.