I made another one. I said I was going to "perfect the design," but I did almost nothing different. I kept trying different things and then ripping them out. I must have ripped every seam 400 times. In the end, I went with what worked the first time.
This time the button is a pin showing a map of Panama.
This inside fabric is so classy and gorgeous. Doesn't match the tone of the cover fabric, but isn't the surprise nice?