Hi Marion

As you probably know, the "fell" is the stitched portion of a pleat. The stitch that's used for the fell is an edge stitch that's like a blind stitch with a slight back stitch. There's a diagram below from my book. The person who taught me kiltmaking said that she was taught that, if the stitches were more than a pencil-point apart, they were too far apart.

Barb