Examine the tear. If the tear is small and straight, then you should be able to repair it very quickly and simply. If it is a jagged, expansive tear, you will use a slightly different technique.
Use a needle and thread to simply stitch a small tear. Apply a small, light coating of rubber cement on the inside of the jacket to seal the repair.
Patch a larger tear to keep it from tearing again. To incorporate a patch in your repair, begin by stitching the tear as described above using needle and thread.
Cut a nylon patch large enough to cover the repair. Patches may be purchased from a fabric store or cut from older garments.
Apply a thin layer of rubber cement to both the garment and the patch, allowing the cement to cure for five minutes before applying. Press the patch firmly, checking that all edges are sticking well.
Use a warm iron to seal the tear after the glue has dried for at least 12 hours . Place a bandanna or thin towel over the garment to reduce the chance of melting your jacket.