You know there are several different ways to attach patches to your clothing. The easiest way is to use the plastic heat-activated adhesive to iron them on. You just put the patch on your jacket or other item, heat up your iron, and then press the patch onto the item. It's quick and easy. There are a couple of downsides, though. You can't easily remove the patch without damaging the article of clothing. You also can't iron the patch on to anything made out of leather because the heat from the iron will damage the material.
Some bikers, especially men who don't do a lot of sewing, may be a little hesitant to try it. However, there's not a lot to worry about. You don't need a lot of stuff to sew a patch onto your leather jacket or vest. The first thing to do is make sure the patch you've bought has die cut borders around it. Most do. These thick borders are slightly raised, giving you more to sew around. Be sure you find thread that matches the border so it won't show up.
Then you just sew around that border. Stick the needle up through the fabric and the patch, pull the thread over the raised border, and then push the needle back down through the fabric. Repeat this until you've stitched all the way around the patch. You don't need to know how to do any fancy stitching. Once you've finished stitching, tie a knot in the thread and you're done. Just be sure your stitches are tight so that the patch doesn't fall off or start to pull away from the material. The first patch you sew on may look a little off, but remember you can always undo it and sew it back on later.