Daily entries from the 17th century London diary
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Collar Days
Knights Grand Cross (in the generic sense) wear collars of orders of knighthood on “collar days”…. In addition, collars are worn when Her Majesty opens or prorogues Parliament, and by those taking part in the ceremony of the introduction of a peer in the House of Lords. They are not worn after sunset, nor when mounted on ceremonial parades such as Trooping the Colour unless instructed otherwise…. http://www.cam.ac.uk/societies/cuhags/info/days.htm#Red%20Letter%20Days