I can relate my interview to you. I signed up for one after I did a tour back in the fall. I wore khaki pants and a button-down shirt and a tie, but no jacket. Bring a copy of the resume, since the interviewer will read that before asking questions. It is a one-on-one interview that takes place in one of the smaller rooms by the admissions office. They will ask you basic questions like a job interview. It is very important to take your time when answering, even if it means taking a few seconds to think out your answer. You will then get the opportunity to ask questions of them. The interview probably isn't a make or break thing, but it can be useful for both the interviewer and yourself. For me, after my experience with the interviewer, I decided not to even apply, because I got a very bad impression from him and although it was probably unfair to judge the entire school off of this one person, it definitely turned me off to Fletcher, although looking at my admissions decisions, I probably wouldn't have gotten in anyways.