I'm in the nice situation where I have a gym & shower at work, so I save on my home water bill by always showering at work. And since I'm getting naked anyways, I might as well change! Which is not to say I wear cycling gear; I do have a chamois liner under my shorts, and I ride with SPD shoes, but otherwise, synthetic and cotton T's, pullovers, real-people socks, etc.

I also have a locker at work, in which I keep a towel, a few pairs of pants, and a pair of shoes. My daily commuting load is a fresh shirt, socks, and underwear. Pants/towel get replaced as-needed.