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What I find of note in this is the how-to-cut T-shirt yarn instructions which are part of this article. This method uses the whole t-shirt, not just the torso. This is much less wasteful than other methods I've come across.

This method makes a rug with fewer holes since the t-shirt yarn is used as a core to crochet over, rather than being used to crochet with. One would need sturdy yarn to do the crocheting with.