A top stitch seam can also be a lengthened stitch that is sewn on the right side of the garment (maybe around the armhole or around the neck or bottom of the garment) such as a blouse etc. Sewn about a 1/4"- 1/2" in. Helps hold down the interfacing or just for looks. It also works if there is no interfacing around the armhole of a blouse (just binding). You can top stitch it down. Hope this helps.
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