I'm working on a dress for my niece, Simplicity 2398, and I have to tell you I was a little nervous about installing the invisible zipper.
It wasn't the actual sewing of the zipper that had me worried. I threw away that plastic invisible zipper foot (don't waste any money on those things) and have a solid-made-for-my-machine invisible zipper foot for sewing invisible zippers. It had to do with the fabric that I'm working with and the design of the dress.
The fabric is a fancy occasion fabric, shiny on one side, dull on the other and
Honestly, I don't know if I could have done a good job without basting tape.