Uniforms are said to be a prescribed set of clothes for members of an organization, such as soldiers or schoolchildren. Uniforms help develop a standard image. Modern uniforms are most often worn by armed forces, police, emergency services, security guards and by inmates in prisons worldwide. In some countries, some other officials also wear uniforms in their duties. Uniforms provide uniformity. Uniforms vary from a standard issue T-shirt to rigorous requirements for many items of formal wear.