I usually wear a sweat jacket with the shirt i slept in underneath (saves time) and then I wear sweatpants. I have like 3 pairs of sweats so I just wear them all then rewash em over the weekend and repeat. No one cares how you dress in college so go how you feel comfortable. In my senior year I wore my hoodies without a shirt underneath cause I would forget to (idk how tho lol) and no one would notice since everyone is minding their own business.