Calendars get crowded around the holidays. It’s not unusual to go straight from work to a last-minute shopping trip, and then on to an office party or gift exchange with friends. Although it can feel overwhelming to dress for a night out before the morning coffee’s even kicked in, it’s actually quite simple if you keep two tips in mind: choose classic silhouettes, and pocket a couple of colorful or glitzy accessories. Her Look  Build your outfit around black, which is both foolproof and chic. Add work-appropriate silhouettes in party-appropriate colors and prints, like this teal military coat and floral pencil skirt. A pair of metallic earrings and some fresh lipstick provide the finishing touches. 1. Cole Haan military coat; Goods Reserve ($289) 2. Floral pencil skirt; Mango ($59.99) 3. Nicole Miller silk blouse; Goods Reserve ($99) 4. Gold-heeled ankle booties; Francesca’s ($159) 5. Golden Goose leather handbag; The Corner ($1,138) 6. Monika Chiang spike earrings; Goods Reserve ($34) 7. Hansel from Basel donegal tights; Penelope’s ($35) His Look A few key details keep this business-casual look from feeling stiff come party time. Dark-rinse jeans transition easily from the cubicle to cocktails, and the plaid of this skinny tie is a more sophisticated take on holiday tartans. 1. Herringbone blazer; Suit Supply ($399) 2. Tonal dress shirt; Topman ($110) 3. J.Fold braided belt; Goods Reserve ($22) 4. A.P.C. jeans; Penelope’s ($185) 5. Harvey boots; Frye ($268) 6. Socks; Mr. Porter ($80) 7. Square check skinny tie; Apartment Number 9 ($88)