I'd seen this yarn/fabric but only recently decided to try it out.
It's usually near the yarn department in craft and fabric stores. It looks like wide ribbon.
But once you unroll it, you see that one edge is just like the ribbon yarn that has been used a lot to make ruffle scarves. And just like the ruffle yarn, this can be knit or crocheted.
I chose to knit mine and it only took one package to get this lovely lightweight ruffle scarf. I started over several times because I wasn't sure how wide I wanted it to be. I ended up casting on 4 stitches and it's about 4 inches wide and 60 inches long. Not bad for $4.00 and less than an hour's time.
I think I'll buy more!