I have croupers on my llama saddles. I don't like them and the llamas like them even less but they do work. Normally I leave them loose and laid over the back of the saddles until I'm going down something steep.
I'd like to replace them with britching but so far I haven't found any that will fit my saddles. I'm about ready to invent my own but they'll have to be nylon. I don't have any way of sewing leather.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.