Danskos are the greatest thing ever in the OR. I would wear TEDs and Danskos for the free flaps or really anything over 8 hours, just the Danskos for anything else. I don't wear danskos with slacks.
Depends on where you practice on what you wear to clinic. One of my best friends is in rural Ohio and he wears Gap khakis and his danskos or other slip-ons in clinic usually with a polo or other more business casual shirt--he even will wear jeans on fridays. I have to wear a button up with nice slacks and high-end shoes for my area. I will get people commenting on it if I'm not dressed well. In fact, if I go all out and where cuff links or a sport coat I will get lots of compliments compared to my normal wool slacks, dress shirt with sleeves rolled up, and cole-haans. However, I practice in an area where the avg household income is over $210k so there is much more wealth where I'm at then where my friend is at. He makes more money than me, btw.