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Stitch a normal seam. With one layer of seam fabric folded to the side sew a straight stitch to show on right side of fabric the length of seam. Do this for both sides of seam. End results will look similar to a flat felled seam on the outside. A flat felled seam is the type of seam used on jeans that is on the leg length and is thick.
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.
Try this site. This page has pictures that might help with the definition and explaining of the topstitch seam. Hope this is helpful.
http://www.lovetosew.com/seamtopstitching.htm
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