Well footropes are done several ways...dependant on scale and how *crisp* I want the set-up to look. I have made them with nylon thread that was stiff enough to hold its form...prior to adding the stirrups.
But all the foot ropes on my clipper Great Republic were made with wire. I glued the sagging foot rope to the yard then added the stirrups. I then painted the entire foot rope assembly black. They look very clean and retain their nice droop without twisting and flexing of string...type ropes.
Rob