On arrival at a new (fixed wing) posting I was summoned to the Station Commander's office, for a welcome chat. As it was a formal invitation I wore my SD hat (which to be fair had done some tours on Support Helicopters) and smartly saluted the said Group Captain.
First thing he said was that next time I was invited to his office I was to wear my best SD hat. I apologised and truthfully said "But this IS my best hat, Sir!"
"Not any more it isn't!" said he....