One of the most important tasks for an instructor in a classroom setting is to gain credibility with the students, and one of the simplest things an instructor can do to help himself in this regard is to dress appropriately. Of course, one must dress in a businesslike manner, but “appropriate” means different things to different audiences. This is especially true with an audience of engineers. An instructor dressed “too well” looks like someone from marketing. If you walk into the room in a shirt and tie, you must earn your credibility. For an engineering audience, a polo shirt and Dockers is almost an unofficial uniform. Dress right, and credibility is yours to loose.