The only other thing I would add is find things that are reflective or REALLY LOUD COLOURS!!!! Most motorists aren't expecting someone to be riding when it's cold so they aren't paying attention - ok...so they're paying even Less attention then they do in the spring/summer/fall.

I have Illumnite tights, leg warmers, arm warmers and jacket for my winter riding. I also discovered what you wear depends on how far you're going and what type of riding ie: I bike commute. In the mornings my 6 mile ride is all downhill with the last 1-2 miles in a headwind. So dressing cold in the beginning means I'll be even colder at the end. In the evening I have to climb that hill usually with a tail/cross wind so I wear things I can vent easily. I know I'll get warm while I"m climbing but the sun is setting and if I had to wait on traffic - it could get chilly.