Ok, so this probably a big obvious ‘duh’, but I’m gonna say it anyway.
If you have a straight draw plain weave warp on your loom, you can try doing double width by just changing your tie up. Yeah, I know. Obvious. But I thought some who may be afraid of it can get the hang of the whole process by playing around at the end of a warp. I did this this afternoon because I was curious. I use the second to outer most treadles for PW, but I’d left my four center treadles tied up for DW with Top, Top, Bottom, Bottom like Jane did with the skeletal tie-up. That way you just walk the treadles across. I am just finishing up the Granny Pam Warp and had a moment of “what if?” hit me. Since it’s only threaded for GP towels, the sett isn’t right and it’s a little loosey goosey, but it still works. You do have to do a few rounds before the doubleness shows. I’m going to continue and maybe make a market bag out of the last of the warp. Anyhoo, it’s a great way to dip in your toe before committing to a ginorously long warp and feeling intimidated.

What a great idea! I've got the end of a nine yard warp on my David2 and I'm so over it! LOL (Does anyone else just get sick and tired of a warp?) So, trying out some double weave, albeit LooseyGoosey Double Weave, is a perfect way to use it up! Thanks for the inspiration, Deb!

OR you could try a thicker weft for the bag in wool maybe and have a sort of weft face wool bag.