Here's what I came up with, using this pattern as my starting point, but making a few changes along the way. (The biggest change - adding a few rows to make it wider and adjusting the ruffle as a result - probably not necessary if I'd made a swatch and adjusted my gauge in the first place, but, like I said, instant gratification. Prep work doesn't happen when you're crafting on the fly.)I think I'll use these buttons just above the ruffle with snaps inside for the actual closure. (The original pattern provided for button holes between the "petals" of the ruffle, but I'm not crazy about how that looks on mine.) I love these buttons. I dug them out of a bin at a little antique store in Meeker, Colorado when we were holed up there for a few snowy months. I've been hoarding them away for the perfect project.
This is not the perfect project. But, hey, since they're just decorative, I can easily snip them off later and not ruin the function of the scarf. So there you go. I'll get back here soon with pics of the finished product.