It's ALWAYS an interview

Two of the positions were are trying to fill at my company require candidates to take an Excel test. We had one candidate who showed up wearing a t shirt of the local NFL team and blue jeans. REALLY? I of course pointed this out to many people. My boss (the head of HR) was trying to help the candidate out and said "well, it's not an interview". I said "it's ALWAYS an interview". And it is. Every contact you have with the company, from sending in your resume, parking your car in the parking lot, or saying hi to someone you pass in the hall is part of your effort to get the position. You need to act (and dress) accordingly.