Finally finished! Yesss!!
I added some traditional half double crochet at the bottom to give it a better edge and some curve. I also added a kinda stupid little cape thing that sorta looks like a collar when I’m wearing a jacket over it. This hides my ineptitude in back.
And under a jacket:
There’s plenty of room for improvement, as you can see. I suspect this one will disappear from my closet as soon as I can do better. (Soon I hope.)