Well, the softer the material is, the more comfortable it'll be around your neck probably. You'll want something strong enough to hold your weight though, so it really depends on if the cloth would be sturdy enough. If you take your cloth, and set it up in the position you want, you can test it out by pulling down on it with your hands. If it shows no sign of budging, it should be good to use. If you use a slipknot, it should tighten naturally pretty well, but if you stick your hand through the hole and test it, you should get a good idea of how tight it'll be. I hope this helps somewhat, although I'm definitely not an expert. So long as you test things out properly before actually attempting, it should be all good. Good luck with everything.