Update from the Knit Rowan website:
Knit this ladies chunky poncho, a design from the Rowan archive that is now available as a free pattern to download. Designed by Martin Storey and updated using our lovely soft spun yarn Kid Classic (lambswool and kid mohair), this poncho has a cable and moss stitch pattern, chunky rib collar and a dipped hem.

Finished side to side sleeveless width dimensions:
62: 66.5: 72.5: 79 cm
24½: 26: 28½: 31 inches

Yarn Information:
Photographed in Kid Classic colourway Spruce 853
7, 7, 8, 9 skeins
1071, 1071, 1224, 1377 yards