I rarely wear a jacket either - to me it's all about the wool base layers and the zipper in the outer layer - but if I do, it's the same one I wear for cycling, a lightweight breathable PI jacket that the sleeves zip off to form a vest. I'm not sure the model. Just a windblocking barrier keeps a lot of warmth in at running pace.

And I warm up as much as possible in the house. That helps keep me from overdressing to avoid the shock of going out.