The first stitch is a single herringbone and then filled in the curve with closed herringbone making bigger stitches on the outside curve. I suggest you draw the shape/curve you want onto the fabric. It is quick and easy to do and can be used 'as is' or a
English knot instead of French knot. makes a true knot instead of a donut shaped knot. Comment: I believe this is what I know as a candlewick knot. Directions available in candlewicking patterns popular some years ago.