Before nylon cable ties, bundles of cables were held together by waxed nylon cord. It’s still a nice way to to do harnesses in tight spaces, and, I think, looks much more elegant than nylon ties. It’s almost a lost art- few people under 50 know how to do it! (google “waxed lacing cord” to find sources of cord). Thanks Rob! Link.
How To Lace Cable Harnesses