A peaked cap, with a coloured hat band, is intended to be worn with the No 1 Dress uniform, berets are the most common form of headdress seen with other orders of dress and are worn in No1 and 2 dress by some Regiments and Corps. The blue or green No 1 Dress was never universally adopted after its initial introduction in 1947. The reason was mainly one of economy, although it was sometimes criticised as being too similar to police and other civilian uniforms – lacking the immediately recognisable military status of both scarlet and khaki. Khaki No 2 dress being the most usual order of dress for parades and formal occasions. As noted above, the practice of issuing other ranks in line regiments with full sets of both service dress and dress uniforms effectively ended in 1914 and was never completely returned to. Today, with the exceptions noted above, full dress or No 1 Dress uniforms are only held in limited quantities as common stock, and issued only to detachments on occasional special ceremonial occasions. Practices do however vary between units and historic items of uniform are more likely to appear where tradition is particularly strong. As an example, the Royal Military Academy Sandhurst wore scarlet and blue "review order" uniforms until World War I, substituted khaki service dress for parade from 1919 to 1939 and now holds dark blue No 1 dress uniforms for the use of its cadets. The Royal Military Police retain the latter order of dress for general issue. Historically, the Royal Air Force regulations permitted the wearing of a full dress uniform in both home and warm-weather variants. Although the home wear version of full dress is no longer worn (except in a modified form by RAF bandsmen), the tropical full ceremonial dress continues to be authorised. The temperate full dress uniform was introduced in April 1920. It consisted of a single-breasted jacket in blue-grey with a stand-up collar. Rank was indicated in gold braid on the lower sleeve and white gloves were worn. As with the British Army after 1914, full dress was not general issue during the inter-War period, but was authorized for wear by specific categories such as bandsmen and commissioned officers. The latter generally wore full dress only for infrequent occasions such as attendance at court levees and social functions such as weddings. Military attaches and royal aides de camp were amongst the few serving officers who might have regular occasions to wear full dress. Initially the full dress uniform was worn with the service dress cap. However, in 1921 a new form of head-dress was introduced. It was designed to resemble the original flying helmet and it consisted of a leather skull cap trimmed with black rabbit fur.