The invisible zip is a closure that you will find a lot in Maison Fauve patterns. It ensures a pretty finish, and its installation is less technical than it seems.
This mini video tutorial describes how to put an invisible zip in the side seam of your garment.
With my tendency for pretty finishes the invisible zip in this area is a little more delicate than when placed in the back of a garment (which I describe to you in another mini video).
You'll see, it's all in the ironing ;)
Enjoy the video!