Braiding began about 2inches from the connector plugs (near the dash), and was used throughout the harness. Where the wires break-out for the tail-lights, backup lights, and license plates, there may be about 1/2" or so of bare wire exposed on either side.
The braiding has to be applied prior to the molding of the various connectors and as the harness is being made. To replace it means to tear everything apart, start over, and build up the harness with molding the connector plugs being the last piece. Rhode Island Wiring can do this, but be prepared to fork out some dough.
By the way, the original braiding was cotton and can no longer be used due to various Federal regulations (flammability).