I think SRD and others have used seat belt webbing as a second component and many have had good results with that. Some of that material is actually polyester, others are nylon. It may be interesting to see how one performs over the other.

There is a 3" cotton webbing on eBay I think used to restore tambor rolling doors (roll top desks). It is thin but has a nice herringbone weave similar to seatbelts.