That depends on your personal style. If you're looking for a more traditional look, you could wear a red and green plaid shirt with a pair of jeans or chinos. For something a little more fun and festive, you could try a bold red sweater with a pair of black pants. And of course, no Christmas party is complete without a Santa hat or some reindeer antlers. Whatever you choose, just remember to have fun and enjoy the spirit of the season!