I often find holes wear in my jeans between the legs, so I patch them with fabric on the inside and lots of rows of zig-zag sewing.
It's not a very visible spot so it does not have to be perfect, but it definitely increases the useable life of the jeans considerably.
Isn't the seam uncomfortable?
It's not, the fabric is actually quite light so I can't feel it at all. I would avoid using a heavy denim though, I have used that on a knee patch before and it was too heavy.
I might need to learn this... And get a machine. No way I'm doing this by hand without losing a substantial amount of blood.
I'm currently working on patching a pair by hand and it takes forever. I've also stabbed myself several times but that's just how it goes haha