This section is from the "Embroidery Stitches" book, by M. E. Wilkinson. Amazon: Embroidery Stitches.
Buttonhole Stitches. Buttonhole stitch may be arranged in many ways to give variety in ornamental edges. The illustrations shew (a) Dogtooth buttonhole ; (b) Serrated buttonhole ; (c) Scalloped buttonhole; [d) Fringed buttonhole.
In the last example the working thread is passed over a mesh after each stitch, giving uniform length to the loops. A netting mesh, lead pencil, ruler, etc., will serve the purpose.
(a)

(b)

(c)
(d)

 
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