It’s tempting to skip it, but it’s a lot like the difference between a nicely toned body and one that isn’t. Just like you can skip exercising, you can skip interfacing. But, it won’t be a secret. Which reminds me... I need to go for a jog!
Interfacing is a textile that is either sewn in or fused on using a steam iron, between
layers of fabric, to give it structure and body. Interfacing in itself is not very exciting, but it is one of the keys to achieving a professional look to your project. If you are new to sewing, you may never have run across interfacing because it’s not something that shows when your project is done. Most familiar to people is the way a dress shirt has a more substantial collar, placket and cuff. That smooth crispness comes from the interfacing hidden inside. Without interfacing, collars and cuffs would be limp and buttons and buttonholes would rip.