i commute to work and have to look respectable. i dont wear a suit but its still a business casual environment. i live a similar distance away too. things i find helpful.
1) ditch the road shoes. using toeclips make it that much easier for stop and go riding and walking.
2) ditch all light colored cotton pants. khakis are a liability anyway, stick to gray or black.
3) embrace wool. it doesn't get wrinkly as easy and is easy to clean.
4) keep you nice shoes at work. then they will stay nice and you wont have to carry them.
5) get a bag that you can put your tools, maybe a towel, lunch in.

have fun.