Yes there are, search for ordinary lamp wire, but choose the one with most copper strands, some are very flimsy. All the cloth covered wires I have seen have been of good quality, and inside they have modern standard insulation. You can probably find some in a good lamp shop, maybe a local hard ware shop. There are
two core wires, and twisted available. You might need to unwind a bit of twisted wire for the motor, I'm not sure. The old type had two single wires entering the speed controller copartment, the later version had a single two core wire. By 1950 most had some type of pvc or plastic insulation, but 1930s and earlier tend to have cloth covered wiring. I think the US made with rayon woven cloth outer part might be the nicest ones. Most of the Asian made stuff have polyester woven outer part.