As TTN knows well, at Kai Tak we were able to wear a No: 6 - this is a KD No: 1 but with shoulder boards (now just floppy straps) and it is similar to the summer uniform worn in some quarters by the Army.
Although not full ceremonial like the 6A in white (which the RAF insists is worn with black shoes), a No: 6 is actually very appealing and has the added 'advantage' of making the General Service Medal ribbon stand out from the uniform background of a No: 1!!!!!!
Old Duffer