While I dont think it as prevalent as some are making it out to be that so many people sleep naked, i guess it does happen with some. My guess is that the vast majority of guys sleep in underwear or shorts. In general I dont think its a huge deal if a roomie does..id sort of feel it out a bit to see what your roommate or suitemates are like. My experience is that eventually if you become close friends with your roommate nudity will be a non issue and will get to the point of joking and commenting about it..in your room, in showers etc. I had the straightest roommate ever fresh year and at points he would make random comments like...dude your dick looks big today. ( and to those who say he was hinting...he wasnt he was straight as an arrow..but he was comfortable)
as far as showers, walking to them hanging in dorms. it really depends on the setup..if its strictly all guys then you have more avenues..but if it is coed dorms, like most/many are..its not like you can walk out of your room naked. in my case the dorms were coed, the showers and bathrooms were by sex...and if you didnt have a suite shower ( on bathroom for three rooms 6-7 guys) we had showers down the hallway that were 6 stalls 3 each facing each other. There were curtains on them but most rarely used them ..unless I suspect that they were shy or jerking off more likely lol. Most guys just wore a towel or shrts or boxers walking to showers just because there were girls around also...some were more umm trying to show off a bit, there bods, their outline etc lol but most were just using something to cover up.
Bottom line bro just feel it out...if your roommate seems cool go for it. We all like to pretend that everyone if this big fng open jock guy who always wants to be naked..but the fact is there are all kinds of dudes in college. you just want to be comfortable and they do too..if you feel like hey I think he will be cool with me being naked, go for it..it will probably be a relief to him knowing you are cool with it. I was the naked guy with my first roommate...and I could tell he was a little more shy about it. I didnt sleep naked but id be back from my shower dry off in room, stand naked doing my hair etc...id stand naked in sink shaving. At first i think my roommate was shy about it but after like a week he was doing the same.
have fun in college bro the best Fng years of your life!