Because it was still a bit big, I cut out two small slices at the edge to form a dart or tuck. One is in the center back and the other lands on the right side (which will be covered by the decoration later). Closing up these darts snugged in the brim just enough.
I sewed a length of polyester satin (leftovers from my gold skirt) to the cut off felt to make a trim piece. I pinked the seam down to a quarter inch. This seamed edge will form a piping.
The gold fabric is wrapped around and under the salvage edge, forming the piping. The trim piece is attached to the brim by simply overlapping and stitching in the ditch.
Back on the hat stand (aka. milkglass flower vase) to decide the next move. The new black band was too wide as it was. I thought scallops would be pretty, but wasn't confident in my ability to cut them consistently so I opted to trim it down to the same width as the gold piping.
The decoration was applied over the side dart. I hot glued the peacock feathers in place and sewed on a vintage coat button to cover the hot glue. Also, on either side of the brim, I tacked in bobby pins with a couple small stitches to anchor the hat to my head.