If one is dressing up and has quality clothing that is worn as a result of being a quality person who always does their best and works hard, good for them. On the other hand, if one is dressing up and has to have quality clothing in order to impress or to make others think they are better than they really are, then it is pretentious and obnoxious. I work in a business casual environment (dress slacks, dress shoes, long sleeve shirts, sport coats encouraged) and I never frown on someone that wears a suit and looks sharp. Some employees might tease a little bit, but management appreciates an effort to look nice and to look professional. In fact, all of senior management can be found in suits at least a couple of days a week. If I had a new employee that dressed sharply in high quality clothing, I would have a high opinion of that person and consider them someone that cares about the image they project and the company they represent. I would also have an expectation that that individual cares about the work they do and will always do a quality job. However, if they were doing it to simply impress and to put others down, I would be incredibly unhappy with them. Dressing above expectations is not a problem at all if it truly reflects how the person lives and acts.