Tack or pin the selvedges together as above, then, pointing your needle upwards from below, insert it, two threads from the selvedge, first on the wrong side, then on the right, first through one selvedge, then through the other, setting the stitches two threads apart. In this manner, the thread crosses itself, between the two selvedges, and a perfectly flat seam is produced. Seams of this kind occur in old embroidered linen articles, where the stuff was too narrow to allow for any other. A similar stitch (left image), only slanting, instead of quite straight (as in the right image), is used in making sheets.
I used this technique in making craft, with the needle shown in the left image. It worked fine.
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