In the school year of 1995, many of the schools which made the switch to dress code report decreases in crime rate, sex offenses, school suspensions, and vandalism. They also reported that there was an increase in overall academic performance and attendance.
Students can be distracted by inappropriate clothing, like if a girl wears revealing clothing, or if a guy is sagging. It prevents students from learning and their school work.
Sagging pants and tank tops are some of the things that are not allowed in school dress codes. They are distractions in class, especially when underwear is showing.