I am against having school uniforms. For starters, they are most likely very dull and boring in terms of colors or style, and everybody would obviously look the same. Also, if somebody lost their uniform somehow, and they had something like lice or fleas, than there is a much higher chance of somebody else taking their uniform and getting said bugs.
Another thing I dislike is the lack of recognition for the individual's creativity. I think that as long as people do not show anything that should not be shown, they should retain the right to be creative, and try out new fashions or styles.