Oatmeal stitch is made up diagonal rows of two different sizes of square stitches which are worked in the opposite direction from each other.
The smaller squares are like elements of reversed cushion stitch.
Begin by working a diagonal row of interlocking square stitches. Make a tent stitch across one intersection of the canvas.
and then below it make stitches across two, three, four, three, two then one intersection again to form a square.
Repeat step two across the diagonal of the area being worked (note that the stitch ‘encroaches’ which means there is only one of the shortest stitches where the squares meet).
Once this row is complete make the smaller square stitches in the spaces. These begin with a reversed tent stitch, then a stitch across two,
Repeat these along the row. The longest of the stitches should touch at the corners.
Structure of stitch
The two different directions of the stitches in this pattern give it an interesting texture. Oatmeal stitch has a fairly large pattern repeat, but it is good for back grounds.
Identifying Oatmeal stitch
This stitch combines two different sizes of diagonal square stitches, which are worked in the opposite direction from each other.
Rachel Doyle, RSN Essential Stitch Guides: Canvaswork (2013) , p.73
Various Authors, The Royal School of Needlework Book of Embroidery (2018) , p.117