This is what I would somewhat wear during the winter months and yes even when it get quite cold I would be wearing this thin layer jacket and a undershirt with the body heat I produce it's really super warm under it and yes when outside people can see the "smoke" coming out from the jacket not just my breath heh sometimes I have people curious about it and I simply tell them I am a walking furnace with that I unbutton the top part and briefly open it up allowing steam coming out from me and even fog up my glasses. Heh I always enjoy seeing the other person jaw drops or laughs when they see it and most of the time they will say along the line "It's good to be chubby then" to which I would nod in agreement.
But yea story of my life, most of my life I have been wearing light jackets during the winter it's only rare times when the weather becomes severely cold that I try to layer myself up unfortunately I don't own a thicker jacket or even a longer jacket to cover my lower belly, this jacket I currently have is on the short side so in most cases I have to wear my pants OVER my belly in order to protect it from the elements.
The struggles of being massive and having to go out.