Meh, saw a facebook status from someone I marginally knew in high school that was along the lines of "I asked my manager why she chose me for this internship and the first thing she said was she loved the clothes I wore to the interview"
I'm sure it may be a joke (kinda), but things like that greatly dishearten me for reasonably professional settings--I'm not sure what the internship is of course, but as far as I know she's doing like business or computer science type of degree. I obviously understand that looking professional is required, but it shouldn't really stick out at all in the interview process in my mind.