Sorry no pics (don't own a camera), but I do in fact commute in a tuxedo from time to time. I study music in school, and do a lot of freelance gigs on the side for cash. For closer gigs (5 miles or less, anything in my town basically), I'll just ride there in my tux to avoid bringing an extra set of clothes if the weather is nice. I certainly get a lot of funny looks (2 social oddities- adult riding a bicycle, and anyone wearing a tuxedo), but I enjoy it. It's a crappy tux, so I'm not really worried about damaging it.
What's the dressiest clothes you've ever commuted in? Pics are always a plus.