I am working on a new belt using the Bedouin designs that I wove into a wall hanging recently. The Bedouin weave them using a technique called warp substitution. This is warped up exactly the same way as you would warp for double weave. You only weave one layer and end up with long floats on the back. Weaving it in double weave technique eliminates the floats. You weave an upper and lower layer and get a nice band sturdy enough to use as a belt. The other two belts in the photo have been mounted on webbing to give them extra strength. The double weave belt will stand on its own.
I have put charts for the Bedouin motifs that I used in my wall hanging on my blog.