How can a repair a hole in my sheepskin jacket?
I'd suggest you use leather glue to glue a patch from the inner side (with either leather or cloth - whatever suits the design of your jacket best). You can get creative with that and glue some logo or image instead of just a blunt patch (if so, you can do it on the outer side instead of the inner side). But from what I can visualise the leather is not only torn, but also stretched and deformed at the place. If that is the case, I'd suggest before you glue it to try to bring it back to its original shape as much as possible by dampening the affected place with cool water. Water will cause the stretched leather to shrink slightly once dry but while it is still damp you can also stretch it a bit if necessary. Do that only if you are sure water won't damage the jacket.