Hi Kitty, less advice and more reassurance; In my experience with different unis, most of the time a campus is treated as judgement free zone in terms of fashion. Everything above sweatpants and crocs counts as 'reasonably well dressed' in most places, and even those are hardly eyebrow-raising (unless you're, say, meeting with your advisor or holding a presentation maybe).
Business or (pre-)law people tend to be a bit more professional looking, but if that applies to you you're still on the right track with what you posted.
Just relax. Dress for confidence & comfort, and you'll be fine. (and don't be surprised if you come across someone in an elaborate period costume, actual pyjamas, or something that's not pj's but they still appear to have slept in. Expect the last one during finals.)