Welcome to the board. Hope you like it here. Look forward to seeing your work.
I had never heard of this technique before but as I did some research, it appears to be a quilt as you go method. I found this video from Nancy Zieman showing how Betty Cotton makes jackets using that method. It's a 2 part series. This might help you some.
https://www.pbs.org/video/cotton-the...part-1-dyt3xw/
https://www.pbs.org/video/cotton-the...part-2-og41sh/