I had a friend who did this throughout high school (in the US) and continued wearing suits throughout college. His personality was the quiet, docile type but when he started wearing the suits, people started talking. I'm laughing thinking about it now but it was pretty ridiculous the kinds of things people thought. People didn't know what to make of him and kept their distance out of fear that he was associated with illicit activities. The fact that he was the best poker player in school added to this persona.
I, myself, did the Suit Experiment. It only lasted a semester but I wanted to see how others would act. Overall, it was quite eye-opening how people treat you without actually knowing you. They make assumptions about your personality, your finances, even your sexual prowess. Some thought I was arrogant, stuck up, and responded by avoiding eye contact. Others were threatened (the admins) and ignored me.
Every adult was impressed the first time they met me because of how well I dressed. But then they just got confused when I didn't turn out to be of significant importance. I was just a student teacher after all.
The children, on the other hand, didn't treat me any differently. This is because they didn't have the experiences to associate the suit with any kind of social/political/economic importance. They were just as kind as other children have been before and after.
It's funny the differences between children and adults. Adults are preoccupied with appearances and will make conscious decisions to associate with you based on this superficial facet. But children make the decision to associate with you if you are kind, caring, and supportive.
In the end, what I learned from this experiment is that it quickly exposes peoples' biases and personalities. While the way certain adults treated me was hostile, it also forced other people to look me in the eye before making a decision to treat me the same. Adults had to get to know me on a personal level just as the children did. I learned whom I could be open with and whom I could not trust. It's funny that the people whom I could not trust were the administration but I didn't trust them even before I taught at the school. But that's another story.