The zipper is topstitched on one side to the top of the pocket flap, and then topstitched on the other side to the bag itself, with both ends sewn down. So simple and functional. It was easy to remove the broken zipper and put in a new one.
Currently, I'm working on a Nola Cloche for myself that I fell in love with from the photos. I hope my version turns out just as beautifully.