come on! sewing is not a lost art form. My entire 7th grade class, male AND female had to take sewing (we had to take metals, too - egalitarianism and all. Guess where I got the better grade). Can't imagine things have changed so much that you guys have no clue about sewing using a machine. If you have no clue, get one - it really makes life a lot easier if you can set in a fresh zipper into your favorite hoodie or pants, or fix a tear in your gear bag, or tailor your pants or put a back patch on. If you want to get more advanced, you can take your favorite judo t-shirts, as they age and get holes in the pits and turn them into patches for a terrific, very personal quilt.
And, when your jacket tears again, you'll know that it's because the tear is part of a stress area and there's nothing you or anybody can do to make it functional again.
Or, you could take the elements from the sewing machine, turn it into a nice tattoo gun, and just tattoo a jacket onto your body for the ultimate in tight judogi.