Start by wearing one color from head to toe for a chic, slimming look. "Stylists do this all the time," he says, "because it's a great way to use what you already have." To pull it off properly, Boston suggests a fitted black turtleneck and black trousers, winter white pants with your best white blouse, or a sweater set and skirt in an unexpected shade like pink, yellow, or coral ("sets you apart from Santa's helpers"). Look for anything that has a subtle shine, such as light-catching leather, suede, or matte satin.
For accessories, skip the miniature Christmas tree brooch and instead aim for simplicity: diamond studs, elegant pearls—real or fake—or three stacked bracelets on one arm with your shirt cuffs rolled up. "You might feel underdressed at first, but the look has a modern edge," says Boston. If you do want to buy something festive, try vintage stores for an inexpensive beaded bag or a fabulous pair of earrings. "Mix things up," advises Boston, "and trust your taste—that's what separates stylish women."
— Cindy M. del Rosario Tapan