No sewing required, of course. I fringe a little along the edge if I'm in the mood. Mostly they just keep my neck snug with no itchiness. They're highly washable and compliment a lot of outfits. Indoors, tucked into a neckline, they often take the place of a light sweater. Outside, down inside a light weight jacket they are the finishing touch that keeps me cosy.
In a pinch, if I'm out walking a little later than normal or hit a sudden cold spot, I can tie one of these beauties over my head for an impromptu head cover. When I do that I feel a little bit like Maureen O'Hara in film "The Quiet Man".