I keep my engineering costumes at work and periodically take the truck in to the office so I can make a drive to the cleaners. I sometimes bike in with pants but it's cooler and downhill, I usually switch to bike shorts for the ride home.

i saw this online, and am about to change jobs that might need a little more sophisticated clothing rather blue jeans. Haven't tired it, but looks like it will work well.

I had the same problem with changing into a suit for work. I used to just leave clothes at the office and send them out for dry cleaning from there but was politely told by management that it would be in my interest to stop doing that. So I went online and bought a Highson Suit Commute bag on eBay. They only sell those things in the UK and the company that made them went under so they are kind of hard to get. In fact the shipping charge was more than the bag! But basically its a backpack that is designed to hold a full suit. I just fold my suit into the backpack, ride it into work and than change in the bike room which allows me to walk onto my office floor fully dressed. The suit backpack works great. Suit doesnt get wrinkled and I can use the bag when I have to travel for work. Its a really easy way to carry a suit onto an airplane or a train as well.