just thought I'd throw this little lot I've come across at you and see what you think. I regard myself as being of average intelligence except when it comes to (amongst many other things of course) string theory and Denison smocks. My thoughts are that it is early ww2 (brass studs, knitted cuffs) but it has been modified with a long zip. I am of course preparing myself to be shot down in flames!
Managed to get a picture of the label which is unfortunately illegible!!