From the book:
This tunic is both elegant and very relaxed. Knitted in Rowan Kid Classic (a very warm, soft yarn), it can be worn casually over trousers or dressed up with a straight skirt. The textured pattern of hearts and diamonds helps to break up the expanse of the knitting, and the low softly rolled collar is very flattering.

From the Knit Rowan website:
Knit this ladies textured tunic with rolled collar from Elegant Knits. Designed by Martin Storey using our lovely softly spun yarn Kid Classic (lambswool and kid mohair), this knitting pattern is generously sized to fit up to 46 inch bust.

Finished actual chest circumference:
103: 114: 125 cm
40½: 45: 59½ inches

Yarn Information:
Photographed in Canard 871
10, 11, 12 skeins
1530, 1683, 1836 yards