My understanding is that the second meaning (which my wife agrees with in full) comes from train spotters in the UK who would wear their anoraks whilst in the f

My understanding is that the second meaning (which my wife agrees with in full) comes from train spotters in the UK who would wear their anoraks whilst in the field. Of course, Scotch being an obsessive hobby could also just be called alcoholism... but that's a entirely different comment thread :-)