A school uniform is a uniform worn by students primarily for a school or otherwise educational institution. They are common in primary and secondary schools in various countries. Although often used interchangeably, there is an important distinction betweendress codes and school uniforms: according to scholars such as Nathan Joseph, clothing can only be considered a uniform when it "(a) serves as a group emblem, (b) certifies an institution 's legitimacy by revealing individual’s relative positions and (c) suppresses individuality." An example of a uniform would be requiring white button -downs and ties for boys and pleated skirts for girls, with both wearing blazers. A uniform can even be as simple as requiring collared shirts, or restricting colour choices and limiting items students are allowed to wear. A dress code, on the other hand, is much less restrictive, and focuses "on promoting modesty and discouraging anti- social fashion statements," according to Marian Wilde. Examples of a dress code would be not allowing ripped clothing, no logos or limiting the amount of skin that can be shown.