Fall / Winter / Spring

I used to be fat, and love the cold.
Now I'm little baby. I'm 175 pounds, and always cold lmao.
I used to only mountain bike in the winter, and I don't wear a bib... I wear thermals, long johns, and tick gear. ( Rhyno skin )

But I plan on at least riding a bit in the fall, and spring.

Question, Pro Atmos Jacket Maaps... Do I wear that over like, thermals or cold gear under armor?
Do they make thermal bibs?
What do you guys wear in the fall, winter , spring?
Thank you!