Oh wow, you can't wear jeans to class??? That sounds so strict! I never taught at a place with such a rigid dress code. In fact, even in the Bavarian school I attended as a kid, which was otherwise highly conservative, teachers could wear jeans (just as the students... but I guess in Australia they got uniforms).
Okay, so men have to wear suits. But there are a myriad ways to do that in protest. I mean, do they regulate the cut, the fabric, and the colors up the the slightest hue? If not, he could show up all pimped out, while obeying the dress code to the letter. (Actually, if the code only says "suit" it would technically include jump-suits, track-suits, and bathing-suits. But that is kinda stretching it.)