My mum and I saw a quilt like this in a Victoria show.
After ten minutes of trying to figure out how it was sewn together, we asked the maker, Pat Watson. She told us she’d studied an antique quilt and figured out how it was done.
I had to know, too! When I took her class (“Antique Braid”), I was gobsmacked at how slick the technique was. I still am. It’s just like doing up a zipper!