Well, I wear mine pretty regularly for half hour walks, nearly every night. It's been near 0F here recently, and I typically just wear my "lounge clothes" (sweatpants and a long sleeved T-shirt) under the jacket. I do throw on some windpants over the sweats, and I use wool mittens too. This is my coat (not made anymore):
Coat

It's not ultralight. I wanted it for winter camping trips and specificlly a hood and longer waist. Weighs 16oz by my scales.