It’s extremely important that you know how to sew an invisible zipper, as it is commonly used on skirts, dresses and even pants. The Youtube video below is a pretty good tutorial by Otis Fashion.
Personally, this method works best for me, but feel free to experiment around with other methods available on the internet. The invisible zipper foot is a pretty common item and can be found at any neighbourhood sewing supplies store. It usually cost RM5 per foot, depending on the quality (the plastic one is the cheapest) and model of your sewing machine.
Have fun sewing! Cheers!