I found this idea and made a scarf for my mother-in-law. I didn't have enough of the plaid fabric to get one long piece, so I made 2 rows of the gathered ruffle rows on each end. The tutorial calls for flannel, but I think the plaid was a bottom weight (or something that's kinda heavy but stretchy). And the pink was a woven cotton. I don't know what kind of fabric they were - I had them on hand from other projects.
Here's a closer image of the ruffles. It's hard to get them to show up since the fabric is so bright.