A late friend of mine was an officer in the Welsh Guards. He told me that being Officer of the Day, or Orderly Officer or whatever they call it involved several changes of uniform throughout the day, one of which was into the frock coat for the evening, and woe betide any young officer who was in the wrong uniform for the time of day. He also told me that when he was first commissioned he had to go to a number of uniform fittings, on each occasion accompanied by the adjutant. His job was to stand there and shut up while the adjutant discussed any minor alterations required with the tailor. He didnt even get the bill - by convention that was passed directly to his father- just as well it represented at least a year's service pay - hence the need for a private income in the guards and similar "smart" cavalry regiments.