I finished another of the pieces I needed for one particular costume for Steamcon last night, a cincher. It's made from the Butterick 5317 pattern, with shoulder straps added.
It's made from elk leather, reinforced with cotton duck and finished with cotton binding. Still needs some tweaking, but on the whole I'm happy with it. Gun holsters will be attached to this when the guns are finished. Guns, you say? What guns? Why the Nerf N-Strike Recon CS guns that my wonderful husband will be modding for me: