I change for my 5.5mile one way commute, though I wear mountain biking cargo shorts or a biking skirt. Then again, we are still hitting high 90's during the afternoon, so even if I was ok in the morning, I'll roast in the evening, and my route is hilly, so i'll sweat alot. Our classrooms are so air-conditioned that I need slacks, shirt, and jacket to make it through lectures, which aren't really compatable with my bike ride.