I usually use sporran hangers, since I don't currently have a leather sporran strap. Mine are from Oconee Leatherworks and I have to agree with the previous poster that I don't expect I will ever wear them out. They were made at the same time as the 3" wide belt I got from Oconee and both items are super heavy duty quality. The hangers don't use a chain, but rather a very smooth and easy to operate claw-like clasp. There is no chance of them snagging on the kilt.

I made my own sporran chain out of a dog leash for occasions that call for a chain. It is very smooth and completely adjustable. I use the spring-loaded clasp that would normally attach to the dog's collar to close the chain, so I can latch onto any link I want. As long as I wear this connecting part in the back under my jacket, the whole thing looks pretty spiffy. I imagine someone more handy than I could make a custom fitting so this very affordable, sturdy, and smooth kind of chain could be used without my jerry-rigged setup.

Andrew