From the pattern:

“Made with rug wool which is sturdy and requires little care, the diagonally striped pillow is knit in a combination of Stockinette and Garter Stitches. It is worked from corner to corner.”

Materials from the pattern:

Paterneyan Yarn Co.
Pat Rug Yarn #010 White 1 lb.
Pat Rug Yarn #511 Brown 1/2 lb.
Pat Rug Yarn #610 Eggplant 1/2 lb.

Pillow front is knit in diagonal stripes. Pillow back is knit diagonally in one solid color. The two pieces are seamed on three sides and a pillow form inserted, before sewing up fourth side.

color photo on page 53, pattern on page 55