Boys at Harrow have two uniforms. Everyday dress, worn to most lessons, consists of a white shirt, black polyester tie, light grey trousers known as "greyers", black shoes, an optional blue jumper (sweater), a dark blue woollen uniform jacket known as a "bluer", the option of the School blue and white scarf and dark blue woollen overcoat similar to the bluer on cold days and the Harrow Hat, often erroneously called a boater, made of varnished straw with a dark blue band. Variations include boys who are monitors who are allowed to wear a jumper of their choice, and members of certain societies who may earn the right to replace the standard school tie with one of a variety of scarves, cravats, neck and bow ties.