Long, long ago, when my wife and I used to do a lot of caving, I actually sewed our climbing harnesses.
None ever failed, or I might not be here typing this, as we occasionally hung 100' in the air in those harnesses I sewed.
To my knowledge, and for what it may or may not be worth, it's not the strength of the thread that holds you, it's the friction of the strap-against-strap that holds you. Kinda like the fact that you don't actually have to tie a strap or rope to a tree. You can just wrap it around a few times and it will NOT loosen. I've hung that way more than once.
NOT that you don't want to use strong thread, just that you want to create lots of area of friction.
Like I said, just for whatever it's worth.
Rain Man
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