In reply to Patrik333:
> I had an idea for a harness that is also a pair of shorts
Ridiculous idea, it'll never catch on.
http://www.ukclimbing.com/gear/news.php?id=4733
(Actually, have you seen the price of those - really not going to catch on!)
> so you can wear it around and not worry about putting it on/taking it off at the wall.
Merely worry about panicking floor-walkers thinking you've forgotten your harness and tied into your trollies by mistake? (After which, I'd have thought even the less risk-averse climbing wall managements aren't going to be too keen on folk using home-made harnesses.)
In true UCK style, you'll notice I've made absolutely no attempt to actually answer your question. Sorry about that, haven't a clue. Interesting project, best of luck with it.