Uniforms are worn particulary by professionals such as the police, the armed forces, health workers, sometimes workers of a certain firm. It is still a tradition in some schools in Britain (mostly private ones) to wear a school uniform. It usually consists of a white shirt and grey or dark trousers and a dark sweater or blazer with a school badge on the breast pocket and perhaps a cap (for younger boys). Unlike the boys who do not mind wearing uniforms because they do not differ very much from ordinary clothes, the girl´s dress since it consists of a plain coat, a blouse and a skirt in some dark colour, such as grey, navy blue or brown. Girls would prefer ordinary clothes to express their personality or perhaps they just feel more comfortable in jeans and a T-shirt. The argument for uniforms is that they prevent competition among the girls and hide differences in family incomes. Costumes on the other hand reflect the style of a past time. Apart from the theatre they are not seen very often, only on special occasions. Scotsmen are well-known for their national costume which consists of a kilt, knee-length woollen socks, a cap and a sporran. The kilt is made of a tartan.