Jenn on Twitter: "Zippers in spandex? Lay down a stripe of non-stretch interfacing along the seam allowance. It'll stabilize your zipper so you don't get that ridiculous wave from the fabric stretching
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4meters 5# Nylon Zipper Rosegold Teeth Plastic Coil Zippers With Zip Sliders Diy Sewing Bags Garment Zips Repair Kit Accessories - Zippers - AliExpress
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