Just a caution if you make or buy ones made of nylon--- it's a safety risk...
Ummm...got to disagree.
1 - "require you to use a girth/cinch that has some give to it"
Never understood this argument. Spent my adult life with a leather belt around my waist and it does NOT "breathe". It doesn't give ANY in length, nor would it work if it did. I have no idea how a horse's ribs are suppose to make a leather latigo expand and contract with breathing! Particularly two layers...
2 - "You MUST use a cinch knot to secure your cinch or back up the buckle if you use nylon."
This one works both ways. Why do I tie my nylon latigo? Because I can
. It places less bulk under my leg tied than a leather one does with a buckle.
3 - "nylon breaks down when exposed to light and extreme temperatures, and it gets stiff. You will need to replace it a lot more often..."
I live in the Sonoran Desert. Light and extreme temps? I'd bet we have as much or MORE UV light here, and extreme heat, than most places. And they last for years here. Leather wears faster in the dry heat here. It can also mildew in some climates. I've used both and gave up on leather because a $30 latigo wears out sooner here than a $10 nylon strap. Which wears fastest may depend on climate. Once in a while, I take mine off the saddle and wash them in the sink.
I use a nylon latigo on both sides of the saddle. Tied. Infinite adjustment possible and have never had one come loose in a spook.
A nylon latigo ought to ship cheap to Europe. Unless they charge tariffs....
PS: I don't believe there is a "right" answer on leather versus nylon. I think some people like one and some like another and it may depend on where they ride and how they ride.