This section is from the "Embroidery Stitches" book, by M. E. Wilkinson. Amazon: Embroidery Stitches.
Hat Stitch. So called from its shape. It may be used for borders or for filling in spaces. Make the two upright strokes, join them by one across the top and a longer one at the bottom. As a grounding it may be connected by Cross stitches, as in (b).
(a)
(b)
 
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