Find embroidered large back patches for your Motorcycle Riding Jacket or Vest. You can sew on these patches to leather. They can also be ironed on to Denim Materials however with large patches we always recommend you sew them on. Properly Heat Pressing a large back patch to a Jacket requires commercial heat presses. I can tell you from experience if you use a household iron to iron on a large back patch, eventually it will begin to come off. You can however easily fix this by sewing on the patch when the patch begins to come off. There is no way around this. I'm just being truthful, large patches are not easy to heat press on permanently without the right equipment.