Ah ha! I’m not the first person to come up with using washers as pattern weights, and I was trying to find my source. After two days of searching, I believe I got the idea for the pattern weights from Casey’s Elegant Musing. I feel much better now.
Yesterday I had a dressage lesson. While I was riding around trying to find my instructor (there are multiple arenas, and the usual ones were in use by the summer horse camps) I took this picture of Whisper. He’s wondering what the heck I’m doing, and when he’s going to get his grain.