Speaking of Santa Claus, unless you've been hired to actually play Santa for your co-worker's children, don't wear a costume to the holiday party. A cute Santa hat might be OK, if that's your thing. But you don't need to pull out your elf ears and curly shoes. Or your felt reindeer antlers. Or your quilted Mrs. Claus Christmas skirt. Or your "sexy Santa" outfit. Really -- please don't pull out your "sexy Santa" outfit. If you feel compelled to show off your holiday spirit, add a splash of red or green to your outfit, or wear a tasteful winter-themed scarf.