Source: THOMAS, Mary (1934). Mary Thomas’s Dictionary of Embroidery Stitches, London: Hodder and Stoughton, pp. 24-25.
Digital source of illustration (retrieved 19 October 2016).
WV
Knotted Buttonhole Stitch
Knotted buttonhole stitch
The knotted buttonhole stitch looks very much like a blanket stitch and is often used to fasten the edges of a buttonhole, since it is much stronger that the buttonhole stitch because of the knots.
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Embroidery stitches