These differences could keep intact the ailment the uniform policy seeks to remedy. There are legal challenges associated with implementing a school uniform policy as well as social issues. It is a different situation with private schools because there a choice has been made to attend that school and wear the uniform that is required. With public schools there is too much room for deviation. However, most if not all public schools have some sort of a dress code.
Some codes are stricter than others.
While some schools require collared shirts others may allow T-shirts but restrict the wording on the shirts. These restrictions often lead to freedom of expression issues and the arguments are increasingly finding their way to the courts. It is a fine line that guides proper attire. Kids often formulate their own dress codes on a subconscious level. It is not usually a style that adults approve of and that is usually the point.