Part of the uniform Silsoe. It's like the doorman at Claridge's or the chauffeur.
You'd look a prat flying your 206 or R22 to a hotel for the weekend with as VF describes it the Kaptan Klown kit.
OK for the ex service wallahs but not done in civvy street.
There is probably more need for ground ambulance crews or firemen to wear that rig. I even notice the leather flying gloves worn by the driver in a lot of police camera action movies.