When I purchased these, I had no idea what their original purpose was, they were in a lot of jewelry and crafting materials I picked up a few years prior at a garage sale.
They turned out to be Western Collar Tips, what every well dressed cowboy would wear. They had a 1960’s look and the wide end was hollow. One side had an adjustable knob on it, all it needed to attach to the headdress was a hole in the leather, the other side had embellishments that I removed.