It is strip pieced, and it was quilt-as-you go.
It is made from three pieces, two fronts and a back. They were each made separately. (Meaning I didn't make one big panel and cut it apart.)
The quilt is completely reversible, and is made without bulk in the side and shoulder seams.* The fabrics are all cotton and the batting is also 100% cotton.*My biggest issue with quilted clothing is its bulk. It's hard to make a garment that's flattering when you use a filling and quilt it. I also dislike the bulky seams, so I devised a way of making this vest reversible, but eliminating the bulky areas where the sides meet and the shoulders join. I figured it out by myself, and I'm not telling.
Well, maybe. (Not sure I can remember, actually...)