Ive not ever heard of this before, but it sounds really silly. Human hair is not in any way a viable hair to make warm clothing out of. The quality of human hair is incredibly inconsistent and variable, and massive amounts of it are needed to do anything since the lengths vary so much. The amount of effort needed to process human hair to any useful form would far outweigh the benefits of using it over something far more commonly available like wool, which is better in every way.
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