I wanted to chime in on this because I have had a personal experience just like this.
First, I wouldn't wear a suit. There is no need to take it that far. You want the dean to see you as a human, no as a "pre-med robot" clone. When I went, I wore nice pants, a dress shirt, and a tie. I have to admit, I looked damn good! If you walked in there with your dark suit, shiny shoes, and perfectly greased up hair, you will look like every other pre-med who has meetings schedule with him. Wear what you think he would wear. I don't know Filo, but from what I'ver heard, he's a pretty chill character.
Now that you are looking fine and ready to go. The biggest peice of advice I can give is to have questions, lots of questions. If you were to walk in there, tell him why your think you should get in and then show him a rec letter, your meeting would take all of ten minutes. You need to get Filo to talk. Practice asking your questions, make sure you have at least a half dozen questions to ask. You need to appear interested in the school, they have gone through hundreds of applications this year, and I can promise you that you aren't that much different than the majority of them. I used to think my application was pretty special, but after going through this, I can confidently say that you aren't going to have any expereince/story that these adcoms havent heard before. They have been doing this for years, and your application is just one of thousands. I'm not trying to be mean, but you have to get across the point that you aren't just a profile, but an actual person.
Ask questions, appear interested, appear excited about school and medicine, and be personable. Don't try and impress him with your GPA or your "amazing accomplishements."
I am 100% confident that my acceptance to UTSW was because I had expressed a great interest in their school. I am an non-resident international student, and the chances of me getting into UTSW were slim. I knew this and decided to do everything in my power to increase my odds of acceptance. I called/email with Dr.W at UTSW about a dozen times. I made sure he knew my story, and that I was working my ass off trying to get into his school. When it came close to application time, I called and scheduled a meeting to talk with him. He knew that I had to drive up to Dallas just for the meeting, and that it was a big deal to me. I researched the school, had lots of questions, and tried my hardest to be personable. We talked for over an hour. He took me on a tour of the school and stayed in touch throughout the rest of the cycle leading up to the match. I hadn't received an interview, and it was late November. I email Dr. W asking him a few questions and within thirty minutes, he called me on my cell phone to tell me that they were offereing me an interview. He told me he wanted to make the call himself because he knew how badly I wanted it.
Without that meeting, I don't think I would have had a chance at getting into UTSW. This is a great opportunity, don't waste it.