This is what it looks like on the inside. The curved princess seams are actually the finished edges of the underlay.
And from the right side, this is how it works - you just pull aside the overlay and underlay to expose as much as you need to feed baby. It's easy to operate one handed and I found it stays securely closed during daily wear, and nicely out of the way while feeding.
Ottobre have come up with a real winner in this design!