I found some linen that I used for patches at the JoAnn Fabrics shop. Online, try Joanns.com and fabric.com. The trouble with online ordering is that without seeing the stuff in person it's hard to judge the actual thickness, but the product description will tell you whether the product is 100 percent linen, or a linen / cotton mix, or a linen/synthetic mix and whether they recommend it for handkerchiefs, pants, drapes, or whatever. Some places will allow you to order a small sample swatch for $.75 or $1, so you could get some samples at a nominal cost without investing bigger bucks on a piece of material you can't use. I've bought pillow ticking from onlinefabricstore.com, but I don't know if they carry linen usable for patching. Good luck. SCL