The 'wings on woolly pully' nonsense started as a tongue-in-cheek joke by a Vulcan squadron Flt Cdr in the late '70s. Unfortunately someone took him seriously and we then had to stitch the cloth moth onto the wretched pullover. Wearing flying kit to and from work wasn't allowed back then, so it wasn't easy to escape having to wear the thing unless you wore the awful 'thunderbird jacket' instead!