I have noticed that on business trips when I am better dressed, I am often treated better at hotels, shops and restaurants than when I am more casual. Paris stands out for that. But I still wear what I want, and don't care what others wear. I am reminded, though of an office manager I had when business casual was first coming in years ago that complained to people that she thought were over-dressing that they were making less well-dressed people feel bad. She was a pretty terrible office manager overall, though.