Update from the Knit Rowan website:
Knit this ladies accessory round neck poncho, a design from the Rowan archive that is now available as a free pattern to download. Designed by Martin Storey using the amazingly soft chain construction yarn Alpaca Chunky (alpaca and polyamide), this versatile poncho is knitted in stocking stitch with a garter stitch edging.

Finished side to side sleeveless width dimensions:
76.5: 82: 87.5: 92.5: 100 cm
30: 32½: 34½: 36½: 39½ inches

Yarn Information:
Photographed in Heron 078
5, 6, 6, 7, 8 skeins
380, 456, 456, 532, 608 yards