Also known as the zigzag hem stitch.
Source: THOMAS, Mary (1934). Mary Thomas's Dictionary of Embroidery Stitches, esp. pp. 114-115.
Digital source of illustration (retrieved 10 September 2016).
WV
Serpentine Hem Stitch
Example of a serpentine hem stitch.
The serpentine hem stitch is a form of hem stitch. It is basically a close variant of the ladder hem stitch, in such a way that the second line of stitches does not combine the same vertical threads as those of the first line, but combines an even number of threads from one stich in the first line, with another even number of vertical threads from the adjoining stitch in the first line.
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Embroidery stitches