Ah, wonderful, a pattern you've worked out yourself - it's always nice when you get something like that right by trying it out and adapting it. Well done!
At some point I had the problem of wanting to sew something triangular into a dress and had to play origami to solve the puzzle of how to make the seams match up well and neatly (and not create super thick seams).
Here, have a look, I've started a channel where I publish my sewing projects. I'd be delighted if you took a look :)
I love to fiddle and work things out. Thanks to reading ❤️💕