This is an easy, yet difficult stitch.
It is easily made up of a line of Running stitches, long on top with a very small bite on the back. The difficulty is in making the slanted Straight stitches equally long and at even angle.
It is easier on Aida or counted weave, very hard on plain weave, where I confess to using a ruler.
Aida Sampler
Sunday Stitch School Reference Chart
Teal Wool Tailoring Scribble Cloth