Hmmm, yea, I know what you mean. I have a bit of a reputation for pointy shoes and dressing up, but since I started commuting to work by bike I've started moving toward things that fold up easily into my messenger bag and one of the three pair of shoes I keep under my desk at the office.
The other problem is that my body shape has changed and a lot of my more fashionable clothing doesn't work so much. I put down muscle rather easily and Cavalli doesn't make jeans to fit cyclist quads.

On the other hand, I've lost a good deal of volume on my waist/upper thighs, so the waist and butt of a lot of my pants look really lousy and sloppy. I find that I don't stop to shop so much riding my bike home, either.