He or she shed his last skin sometime yesterday. At first he was the same color with the same markings as he was when a gobbling caterpillar, and I could tell he had changed form only by his new shape and his “safety harness.”
Now he has developed his protective coloration and blends in better with his surroundings. I’m assuming that he will overwinter as a pupa.
You can see the safety harness better here. It contrasts with the lavender ribbon on the azalea stem.