Hi Yes 1000,
These sleeves below look like the ones i bought awhile back, they are 20 in in length so they might not provide as much protection as you are looking for, and if you use them on your legs, they might be too tight if you have thicker legs--i have skinnier legs, but still they only go slightly above my knee.
Re: Hemp and linen--mostly i have bought this stuff at thrift stores. I have a pair of heavy duty hemp jeans that i bought off ebay. The company that made them is an Australian one, and the brand is something like Hempcell (i will check later). Joerocket brand came out with a Hemp jacket which they said in their tests was as tough as their leather jackets--i don't have it, but have seen it. A cheap alternative might be a moded Thrift store Linen sport suit top, much thicker fabric than the typical button down shirts i double up.
I also have bought some Linen dress shirts off of Men's wearhouse--because they somewhat regularly have 50% off/buy 2 for 1 sales.
Good to know about the Cordura fabric and how much protection you need. The dyneema sleeves should help quite a bit, but unfortunately, it's not even close to full coverage. I will be watching this thread with interest and see if anyone knows of a source of that Schoeller fabric you mentioned. If it's half way affordable, i would buy some to add to my clothes as well.
If you knit or crochet, or know someone who does, you could possibly get something made from buying a crap load of dyneema or kevlar cord. Dyneema is stronger tensile strength wise than kevlar, but kevlar has better heat resistant properties--so might be better for a high friction/protection clothes--at least i know it's preferred in bullet proof vests because of that property compared to dyneema/spectra.