A customer asked for this design not long ago, and I had a lot of fun trying to figure out the easiest way to construct it. After a few false starts, I finally came up with something I'm happy with. It can be made with a tie (shown) or a button closure.
I have been admiring the circle scarfs that seem to be so popular, especially the moebius strip type that, technically speaking, have only one side. Alas, my version has two sides but it is very easy to make and works up fast (would you believe less than an hour?) when you use a giant hook (size Q) and 5-6 strands of yarns at a time.