If you are looking for an invisible zipper foot, hopefully, you already have a sewing machine. If not, then you probably need to buy or borrow one because the foot for invisible zippers can't be used without one!
An invisible zipper foot is used on your sewing machine to sew on invisible zippers. It's amazing the different sewing products that you can find out there. The invisible zipper foot is especially useful when sewing clothing because of the invisible factor.
There are a lot of places to buy an invisible zipper foot, including your local sewing shop. Even online you can buy an invisible zipper foot on Amazon for only a couple of dollars. There are also online sewing shops where you can buy an invisible zipper foot for your sewing machine.
So before you begin sewing jackets, pants, or anything else with a zipper, why don't you think about buying an invisible zipper foot first? There are many resources on the internet that (although not invisible nor zippers!) can help you find what you are looking for.