Why Should You Stitch A Conventional Zipper From Bottom To Top?
When sewing a conventional zipper application, using a regular zipper (not invisible or separating), it is best to stitch each portion of the zipper starting at the bottom and moving up towards the garment's top. This type of directional stitching helps with two important zipper construction aspects:
I. The zipper remains better aligned when stitched from the bottom upwards. Stitching in this direction ensures that any tension and rippling in the zipper tape is released at the top which also helps to preserve the zipper's bottom alignment along the seam.
Sometimes, the top portion of the zipper tape can shift and get caught by the machine needle and presser foot at the beginning of the stitch. Conversely, the bottom of the zipper tape tends to lay a bit flatter which allows for more control and stability.
Sometimes, the top portion of the zipper tape can shift and get caught by the machine needle and presser foot at the beginning of the stitch. Conversely, the bottom of the zipper tape tends to lay a bit flatter which allows for more control and stability.
II. When the zipper is stitched in closed position, it is easier to stitch from the bottom to the top as this will keep the zipper slider more conveniently out of the presser foot's way.