XH328
Is it really that hard to just put a jacket or vest on? Ok so it might not save your life but it will keep everyone happy and you never know it just might help you not get run down. As for hearing planes coming, I work at Duxford and it is surprising how quiet some planes can be when you have your back to them.
As for the arguement about them not being fire resistant, could I ask a question? Is all the clothing you wear fire resistant when you go live side? Someone noted the French dont wear vests and only from my limited experiance of one French crew at Duxford I know they dont mind smoking under their aircraft either!! So just because they dont doesnt mean it is a good idea.