I work in IT where everyone else is a relative dinosaur (50+ years old). I used to wear a coat, but that stopped after the first week. I also stopped wearing a tie after the first few months too since I really was overdressed compared to my peers. My lunch buddies tease me a lot since I bother to color coordinate my shirt, slacks, belt, watch, eyeglass frames, and shoes.
I wish I could interact with the dudes/dudettes in finance and HR. I've seen a ton of sharp looking guys over there and more importantly, a few well-dressed ladies to boot.