In a pinch, you can use duct tape to repair a tear, but for a more permanent repair I recommend using repair tape.
Four ways to repair a ripped down jacket - trailside to invisible fix!
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5 Things You Should Include In Your Repair Kit - FarOut
Repair a HOLE in your Insulated Jacket with Tenacious Tape !
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NoSo Patches How to Repair a Camping Tent Tear
Repair Torn Gear - Patch a Hole in a Tent, Jacket, or Sleeping Bag
Tent and Canopy Repair - Rips, Tears, Holes, and Leaks
How To Repair Torn Waterproofs - Outdoors Magic