I know there are a ton of tutorials all about sewing a zipper on a pillow. Most tutorials also use a special zipper foot. I don’t have one and never had, so here’s how I do it. Start with your cut piece of fabric, laid out, right side up. Then, place your zipper, right side down, and align the bottom edges. Leave the last few inches of the zipper open, like this:
Then sew, with your normal foot. I keep the edge of my foot along the outer edge of the zipper. Stop just before the zipper pull.
To finish that side, I then pull the zipper up, beyond my stopping point. I start sewing, back stitch a few, then carry on until I reach the end, back stitching again to lock the threads.
So that’s one half of a zipper.
Lay the fabric and zipper out, right sides still up. Now, place your backing fabric on top, right sides down. Pin along the edges, leaving the zipper slightly undone.
Sew along the outside edge, just as before, stopping before the zipper pull. Pull the zipper up, then start sewing again. Now, you’ve got a zipper.
But let’s finish the pillow. Align the top and sides of your fabric, pinning in place. I like to sew one side, pivot to sew the top, pivot again to sew half of the last side. While my zipper is completely closed. Keeping the zipper closed makes it easier to pin everything together where it should be.
If I sewed all three sides with the zipper closed, I’d be stuck with an inside out, unusable pillow cover. So, open the zipper, then continue sewing the rest of the way down. Because I’m lazy, I sew over the ends of my zipper with my machine about 20 times, just to lock the ends in.
Turn it right side out and put it to use.