Greetings & Thanks for all the leads.
The Dixie Gun Works cords looks nice and very appropriate size wise. Would look even nice, to my eye, in a dark green.
The local Joann Fabrics has a heavier cotton braided cord - about 5/16 dia. in black, white, light gray, and forth color, possibly navy blue, can't remember exactly what my daughter mentioned. She brought me a few yards of the light gray to play with. Might see if some if it takes kindly to green Rit dye.
Again, Many Thanks,
Kevin