Knotted buttonhole stitch
This stitch is a variation of buttonhole stitch: it is wider-spaced than a typical buttonhole stitch and has a knot at the end of each of the buttonhole’s ‘leg’.
It is often confused with knotted blanket stitch - an edging stitch with an additional knot in each buttonhole loop.
Method
Starting from the left hand side, bring the needle and thread to the surface.
Wrap the thread around the left thumb.
Take the needle under the thread toward the tip of the thumb.
Slip the loop off the thumb and take the needle down into the fabric.
Leaving the needle in the fabric, bring the point up again on the base line, ensuring the needle goes over the base of the surface thread to anchor it (as you would for a normal buttonhole stitch).
Tighten the thread against the needle.
Pull through the thread to complete the first knotted buttonhole stitch.
Repeat the sequence
to complete another knotted buttonhole stitch.
Continue along the line to produce a border.

Structure of stitch
Embroidery Techniques
A border stitch sometimes used to simulate fringing. It can also be used an edging stitch.
Related Stitches
References
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Mary Thomas’s Dictionary of Embroidery Stitches (1934) , p.24–5