Effective Use of Directional Sewing
To prevent twisting in a garment, all seams should be sewn up from the bottom of the garment, or sewn down from the top of the garment. High-end sews up.
Sewing up from the bottom of the garment, is more difficult than sewing down, as the seam’s two plies must meet, notch-to-notch, both at the beginning and at the end of the seam. Operators who sew up are generally paid more than operators who sew down as they as a rule are highly skilled.
Sewing down from the top of the garment, is easier than sewing up from the bottom of the garment. If the seam’s two plies do not meet at the hem, the hem can just be sewn a bit off skew. Operators who sew down are generally less skilled than operators who sew up.
Zippers are except from this rule
Zippers are sewn up and down, instead of always in the same direction
Which direction a zipper is sewn depends on which direction allows the ply with the most ease to be sewn down to the feed.
Unless fabric is fused, it has give; zipper tapes have almost no give.
Laying the ply with the most ease down to the feed enables the feed dog to ease in the slight stretch in the bottom ply, allowing the two or more plies to be sewn together correctly. This is why industry sews zippers first one direction and then the other. Zipper tapes have almost no ease, making it almost impossible to sew a zipper correctly to a seam allowance if the zipper is down to the feed.
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