I remember a talk back when I was at the UW — a representative from IBM came and gave an info session to about 100 students from comp-sci and comp-e. We were all ears. I distinctly remember that the rep talked to us for about an hour, and that for at least 20 minutes of the talk, she lectured us on the importance of wearing a suit to your job interview. She herself was wearing a suit, of course. If I recall correctly, none of the students were wearing suits, but several of them, including me, were wearing looks of astonishment. Twenty whole minutes — a third of the pitch — was on how important it is to dress professionally when seeking a job.
I don't think any of those 100 students applied there.