I have a pair of knee warmers that will not stay up. Well duh, they have gripper elastic at the bottom, but not at the top. If I didn't really like them I'd just forget about it. So I need to buy some gripper elastic and sew it in. There are no sewing/fabric shops here for probably 60 miles, and I don't even know if it's readily available there. Anyone got a source for a couple yards of this stuff? And more importantly, any tips on sewing it in? I do have a stretch stitch on my machine.

I looked online and fouond a place that sold it ina a 50 yard roll, but clearly that is overkill. What about the new silicone based elastic? That would be good too.

Martha