This instructable will be following how I made version 1.0 of this bag from an old pair of jeans. It worked out OK, but the pockets aren't that useable. The cargo one pictured third is definitely an improvement on my first attempt. However both follow the same construction techniques, so this should guide you for whatever kind of chalk bag you would like to make, including a standard one without pockets.
Step 1: What you Need
Outer fabric for your chalk bag. I used an old pair of jeans for this one so I could integrate the pockets and belt loops into the design. The second one I made (see third intro image) was from an old pair of cargo pants, and I used the cargo pockets as part of the design. If you are doing a plain chalk bag, you can use whatever fabric you like, provided it is relatively sturdy.
Lining fabric: fleece or something soft works best, because it will have a stickiness factor for the chalk.
Cord/elastic: to loosen and tighten the bag
Cord stop and large eyelet for the cord/elastic