Particularly for those interviewing for med school, but I think applicable to most everyone:
If you have other options, don’t wear the standard black suit and white shirt. You look just like the other 7,000 applicants. And, since there’re about 30 of you interviewing as a group, together you all look like you’re going to a funeral. Be professional, but don’t be afraid of a little color and/or flare.
Regardless, you definitely show up all of us students who have reverted back to jeans and t-shirts…or scrubs with the stains of the various anatomy juices. Apparently formaldehyde makes you hungry.