In modern times, in the US and UK, gowns are normally only worn at graduation ceremonies, although some colleges still demand the wearing of academic dress on formal occasions (official banquets and other similar affairs). In the 19th and early 20th centuries, it was more common to see the dress worn in the classroom, a practice which has now all but disappeared. Two notable exceptions are Oxford and a society at Sewanee, where students are required to wear formal academic dress in the examination room.