Closed herringbone darning (pattern)
This blackwork stitch consists of straight vertical stitches in a herringbone pattern.
Working left to right, complete a series of five straight vertical parallel stitches over five fabric threads. Each stitch should be stepped down by one fabric thread from the previous stitch.
Continuing left to right, complete another four stitches, this time each stitch should be stepped up by one fabric thread from the previous stitch to produce a chevron shape.
Continue to the other side of the shape in groups of four stitches stepped down and four stitches stepped up to produce the distinctive chevron pattern.
Work back across the shape repeating the same stitch over five threads, ensuring each stitch shares a hole with the previous stitch on that line.
Continue to fill the shape.
Structure of stitch
Various Authors, The Royal School of Needlework Book of Embroidery (2018) , p.153