They prep the clothing. Basically cut the threads used in sewing and make starting cuts in few places. At least that is what I did, but it wasn’t for a movie.
You can do so much to clothing without it being visible to prep it. Everything you see in movies has been prepared to happen consistently or semi-consistently. The professionals have thousands of methods to make things happen.
They’re prepped before hand to make it easier. For example in the old 1970’s “The Incredible Hulk” were the Hulk (played by a professional bodybuilder) would burst out of his clothes, the clothes were intentionally already too small and they scored them with box cutter knives, so that as soon as he flexed they would just rip really easily. It’s all just movie magic things that look easy in films usually take a lot of prep before the cameras start rolling.
There is a technique to it where you get leverage with your knuckles as pivots for each other to get a lot of force at your fingers to tear things apart. With some practice you can use this to tear apart shirts and other things without using much brute force.
If course it is possible to weaken the fabric beforehand. Usually by treating it with acid as this chemically alters the cellulose fibers in the cloth making it easy to rip apart.
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