This is the stitch pattern from episode 14 of YaT. It is similar to the Rice stitch, also known as the Moss stitch. The visual difference is that Moss is a vertical and horizontal grid while the Irish Moss is a diagonal grid. Enjoy.
Irish Moss Pattern
Multiple of 2
Row 1: K1 P1 across your area.
Row 2 (and all alternate rows): K the P and P the K stitches across the area
Row 3: P1 K1 across the area.
Helpful note: If you forget which line you are working in the pattern (row 1 or 3), just look at the beginning stitch. If it is P, then you are working row 3. If it is K, the you are working row 1.