Check here
Seattle Fabrics has either the 50 yard roll, or if you scroll down, you can get it by the yard. I don't think there's going to be anything special to sewing it -- look at the stitching used on your shorts!
Karen in Boise
i gave up on leg warmers. they just don't fit right and they have elastics. and they always fall down...
I got some good ones from Sheila Moon. She has them in actual sizes. Normally I don't like her stuff, but they work! I still get a bit of the sausage effect, but some days they make more sense than tights or knickers (and I only have one pair of knickers), especially if it's early in the day and it will be warming up later, or vice versa.
I tried this on a jersey that kept riding up: very cheap quick fix!
Find a tube of clear silicone sealant (I used RTV silicone sealant) and spread a thin strip along the top edge. Let it dry for 2-3 days, it will leave a rubbery film that will grip perfectly.
Should be able to buy it at your local hardware store
RTV - whoda thunk? I'll try it. Worst that can happen is that it doesn't work and I'm no worse off than I am now. Thanks for the brainstorm!
I imagine it will get cool enough to need the knee warmers again someday.