Ninety-three percent of school districts have dress codes or policies on what students wear to school, according to a Government Accountability Office report. These policies are meant to provide guidelines on what students can and can’t wear, including specific pieces of clothing, hairstyles, and accessories. Dress codes can vary widely in what they restrict. Some schools even require students to wear uniforms. Most often, though, dress codes ban clothes that the district considers revealing, distracting, controversial, or pose a safety threat to students.