I fixed a jacket with an L-shaped tear last week. It was waterproof, so could not use interfacing. I ended up using the inside pocket and fabric glue to strengthen it, then did a 3-step zig-zag over the tear to make sure the edges were well fixed down, and would not catch. The owner (grandaughter's dad) was absolutely delighted when he got it back, grandaughter came in and said "granny, my dad said you are a genius"