I have some old phone wires at home, i'll see if I can dig them out and see how they match up. Probably early 90's manufacture, USA purchased.
Also, for the webbing, first thing that popped in my mind was US Army cotton BDU belt, old style, not the new nylon crap. Image below. I know they (used to at least) have a white core. I know in the early 80's they were easily available genuine issue, not so much any more. Also, the dress uniform black belts were slightly elastic.
One small problem with this is they are 1.25 inches, not 2".
I wonder if they are made that wide somewhere?
What do you think??