way through. we will need a bit of zipper left to sew it inside of the fold. now we need to secure end of each side of the zipper on the bottom of it. you should look for a place where zipper will bend and disappear in the fold of the fabric. i have put pins all around the fold. when you start sewing on your machine please remember to sew back and forth with reverse gear. do the same on the beginning and the end where zipper is folded in to the fabric. it will make sure to keep all parts in the position. to make it even stronger 