@Piss_Ant The leather needle and thread won't be expensive, it'll just be a bit of a pain in the ass to do the repair, because it's hard work on your hands pushing the needle through such thick material.

I have a pair of pliers I use to help push the tip through and then grab the tip on the other side with the pliers and pull it through. That helps. And depending on how thick the leather is, they have awls which is a cheap little tool you use to punch/poke a tiny hole before you put the needle through so it's a lot easier.