I would have people show up for O/N flow positions in suits for interviews. You better believe if they care enough to get in a suit and tie at 9pm they would care enough about the job!! There's no such thing as being overdressed for an interview!
Don't know if anyone caught this story, but thought I'd pass it along!!
http://6abc.com/society/target-employees-help-young-man-prepare-for-job-interview/506243/