KissMyAxe wrote:You're overthinking this. Do NOT wear a suit or coat if you're sitting in on classes. At least at my school, I've seen one student wear a suit at any point (he was in charge of the moot court intro meeting). No one's going to be impressed with your suit, and it might weird some of your potential future classmates out. Just wear whatever is comfortable to you. A button down and khakis is obviously fine, but a polo is not dressed down. Hell, for my tour of my school, I was recovering from some surgery, so comfort was of upmost importance to me, and I wore a tshirt, basketball shorts, and sockless moccasins. I had a great conversation with the dean and the admissions officers and it obviously didn't affect my admission. I know it's normal for law applicants to be neurotic over everything, but really, no one cares or will remember what you were wearing. Just don't worry about it.
I also would not bring a resume. If they wanted one, they'd ask for it. And if you've already applied, they have your file right by their desk anyway.
It's just really weird to walk in holding your resume
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Seriously though, a sport coat would be totally appropriate at my school. As would a polo and chinos, jeans and a sweater, whatever. A full suit would be an outlier for a visiting student but I don't think it would look crazy or anything. (We have students in suits at various times and our profs suit up to teach.) But a suit is definitely not necessary so if you don't love your suit there is no need at all. CAVEAT: if you're doing an official admissions interview (instead of just a visit) it's worth caring but I couldn't say what exactly they want you to wear. Our interviews are all on skype, but you'd want to be wearing business for them.
Having a resume handy seems smart and normal. Store it in a folder and don't whip it out unless you're being evaluated by an interviewer and discussing your qualifications (not just chatting about the school).
In terms of visiting classes, be polite and respectful and err on the side of being quiet and unobtrusive. Like, don't talk in class unless the prof asks for volunteers and calls on you, don't interrupt, don't be loud. Do feel free to chat with students as they're leaving if they look open to it. If they're not in a hurry, it's a good way to get questions answered by people who aren't in admissions.