From the knit Rowan website:

Knit this ladies cap sleeved tunic, avaialble as a free pattern to download. Designed by Sarah Hatton using the stunning yarn All Seasons Chunky (cotton and acrylic), this easy to wear sweater has a chunky roll neck collar and split detail at the welt.

Finished width dimensions;
46.5: 52: 57.5: 62.5: 68 cm
18½: 20½: 22½: 24½: 27 inches

Yarn information:
Photographed in Jetsam 609
7, 7, 8, 9, 10 skeins
651, 651, 744, 837, 930 yards

Gauge notes:
7mm needles are listed as the equivalent of US10.5 needles (6.5mm)