You can find some beads pretty similar to the ones on the coat at many craft stores, or you can craft your own with a strong clay like Fimo. I've head of people decorating spools for the beads in the middle, and it works pretty well. Just string them together by using different sizes of chain.
Most people just make the chains detachable from the coat, so you can wash it, by sewing on little fasteners under the fold of the hood/collar. In the games you never see the hoods pulled shut, so there's no real need to make them functional. Most of this you can find in the jewelry section of a craft store.
If you meant something else, sorry, I'm slow sometimes ^^;
