Okay -- winter storm -- Consider instead of "Sweatpants, sweatshirt" you include
fleece pants and an appropriate fleece top (half zip, et al).
Disclaimer: I am a member of REI, but There are lots of other good, better places to get poly fleece & wool.
Bugging in during winter with the power off, cotton or even cotton-poly sweats just don't cut it. Fleece and wool.