So, I finally got around to attaching the band and ribbons this last weekend. The pattern calls for a very wide, decorative ribbon to be sewn on to the hat in addition to the functional adjusting ribbons, but when I reached that point I decided they really weren't necessary; the wide ribbons look flashy if left untied, but I think they're just too wide to tie (and too much on top of the functional ribbons.) So instead I stitched more band around the notch in the back, and I'm pretty pleased with the end result: