The formal uniforms used by police forces were until the late 20th century mostly the same as the uniforms worn on ordinary duties but sometimes with various embellishments. The introduction of newer uniforms deliberately designed as workwear has left the older styles mainly used for ceremonial or formal purposes. The general formal style is a black jacket and trousers with a white shirt and a custodian helmet or peaked cap. A particular variation is that used by mounted police in Merseyside which can be observed when they escort the winner of the annual Grand National horse race at Aintree; this consists of the traditional "Custodian helmet" with an added white plume and silvered chinstrap; along with the style of tunic it bears more resemblance to a late 19th/early 20th century police uniform.