Rebuttals:
While the statistics that you have brought up are very convincing, I must add that those tests/surveys haven't been conducted since 1994. Times have certainly changed. Perhaps people have become more responsible since then, or the kids that did wear uniforms participated in acts of rebellion. Also, I find it probable that these studies were most-likely conducted in a private school, where most students wear uniforms. It's safe to say that most private school don't have such a diverse population of students as public schools. Seeing as you need to pay for private schools, the student's probably come from more stable home-environments, ultimately resulting in better attendance and grades, regardless of if they wear uniforms or not.