From the Knit Rowan website:
Knit this ladies summer tunic, a design from the Rowan archive that is now available to purchase online. A design by Sarah Hatton using the beautiful rustic yarn Summer Tweed (cotton and silk), this long sleeved, openwork sweater has a wide neckline and deep rib welt.

Finished width dimensions:
47: 52.5: 58: 63.5: 69 cm
18½: 20½: 23: 25: 27 inches

Yarn Information:
Photographed in Tonic 551
12, 12, 13, 14, 15 skeins
1572, 1572, 1703, 1834, 1965 yards

Gauge notes:
2 pattern repeats = 11 cm and 7 rows = 10 cm measured over design pattern using suggested crochet hook.