Firstly when you start to put together a Christmas outfit, make sure that you make the look really classic, with a hint of up-to-date sophistication. For example, this Christmas you could set your look with a black waist belt. Going with a classic look I would also choose a bold coloured top and a darker bottom (perhaps black).
For someone with a very slim frame, choose some wide fitting black trousers, a long gold top/dress with a high neck line, with a black sash belt, and some simple gold/pearl earrings. This look can be dressed up or down depending on how your family spend Christmas, this look could also be updated for a New Year party.
For a larger frame, choose a floaty skirt in a dark colour which ends just under your knee, then pick a top in a lighter shade with a deep neckline, and add a pretty necklace in silver or gold. This look can be updated by making sure that you apply flattering makeup. This is definitely an occasion where you can apply gold makeup or red lipstick, but make sure you pick only one feature to focus on, and that your makeup really compliments your outfit.
For those with paler skin, you are very fortunate because you will look absolutely stunning in true reds, greens and golds, the Christmas colours. Try these on in shops to really bring out your amazing look.