I have what my GP calls "knitter's thumb" on my left hand. I imagine it's some kind of "itis"; not sure which one. I'm pretty sure it's not related to MS in my case, but way overdoing it with knitting & crocheting.

I couldn't find anything appropriate to wear that would still allow me to knit, so I kept on to the point where I could barely use my left hand.

You would likely find a market among the many knitters and crocheters out there - it seems to be a pretty common ailment. I do think we're more prone to tendonitis because of MS - nasty bout with my shoulder a few years ago.

Good luck with your great idea!

C