I've been using my DIY Denim Pant Leg Chalk Bag for about 6 months and I thought I'd share some of my revisions to my pretty-flawed original design. In hindsight, the safety pins and carabiner were really, really silly. My bag is much simpler now.
I ditched the carabiner I was using to attach it to my harness and threaded the shoelace through the holes instead. I can just barely tie it around my waist, which is good enough for me. It ends up being pretty high, but I haven't had any trouble so far. It's much nicer than having to reach down low for it as I did when it was to my harness.
Oh, here's a gratuitous link (like Plundr for outdoor rec gear):
I set up a filter so that it only comes to my inbox if there's something about climbing gear (namely: ropes) in the email. Otherwise, I don't care for 95% of their sales. But! If you like SkullCandy, snowboarding gear, and general outdoor apparel, you might enjoy it.