They are aircrew, its their uniform
,
Reminds me of a time of arriving in the USA on a VC10. Probably 80 odd aircrew on board dressed in smart casual rig. Aircraft stops, door opens and the first on board is a supply officer who wants to brief us on the next 30 mins proceedings.
He is smartly dressed in a brand new flying suit and shiney aircrew watch including cut out maps under his knee pads of the Vale of York!
And no - he was never in flying training, nor part of UK MAMS.
C0ck!