Is this really not okay to wear to cl?

I'm a student at UT austin (and a girl). Just so that's clear. So lately, since midterms are in full swing right now, I have been logging quite a few late nights studying. And anyone who does that knows how hard it is to get up the next morning. So obviously, my 1 hour "getting ready" period is tempting to skip on mornings when I've only gotten 3 hours of sleep. So what I have done alot in the past 2 weeks is just lay in bed until about 15-20 minutes before my cl starts, then get up and just throw some clothes on and walk to cl. Anyway, I sleep naked, and what I usually do is just throw on some sweatpants and a hoodie with nothing underneath. I really don't see a need to put anything on underneath because they cover your whole body, they are comfortable on the inside, and they're thick and baggy so you can't even tell I'm naked underneath. But anyway, today I came back to my room after cl and discarded the hoodie and pants and went straight back to bed, and my roommate was like "did you go to cl like that?", and I was like "yeah". and then she gave me some weird look and was like "whatever". is she just being a *****, or am I really doing something wrong here?