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.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"