Students in Houston, Texas public high schools are wearing school uniforms. Most public schools in the United States do not require uniforms, though many have dress codes regulating student attire. Dress codes usually include limits on skirt length and skin exposure. They generally include prohibitions on clothing with tears or holes, exposure of undergarments, and anything that is obscene, gang-related, or unsafe. Some school dress codes specify the types of tops (e.g. collared) and bottoms (e.g. khaki) that are allowed, as well as specific colors (often the school colors). In recent years there has been a significant increase in school uniforms (see below) for all levels of schooling. In most cases, while school uniforms vary greatly, a general idea of what is typically