Gi knee patch

has anyone here patched their worn out knees on the gi pants? I am looking to patch and need some advice to patch them well.

Iron on knee patch might help. I remember putting holes on my toughskin jeans as a kid. My mom always had to place Iron-on's over the holes on my pants.

One of my older gi's has holes in both knees, and patches over both.

I simply got the patches and took them to a sew shop to be sewn on. Relatively cheap, only $5 per patch.