My stay warm gear, I'm happy to say, is seeing less use these days. What it consists of primarily is long underwear, fleece shirt and pants, Aerostich windproof shirt, BMW heated vest. Over this I wear my Aerostich Roadcrafter one peice, Sidi/Aerostich combat lite boots, fleece lined wind triangle for my neck, Shoei RF-1000 helmet and finally elkskin gloves with silk liners.
All that stuff is for temps less than around 40 degrees.
With the warmer weather here I am wearing my BMW Ralley Pro II jacket and pants on long rides and the Roadcrafter for commuting.