From the Book’s website
Smart blazer with back vent
Suitable for the experienced knitter.

From the Knit Rowan website:
Knit this smart blazer with back vent from Smoulder. A design by Kim Hargreaves using the wonderful tweedy yarn Felted Tweed Aran (merino wool, alpaca and viscose), this knitting pattern is suitable for the experienced knitter.

Finished width dimensions:
45.5: 48: 50.5: 53: 55.5: 59.5 cm
18: 19: 20: 21: 22: 23.25 inches

Yarn Information:
Photographed in Graphite
15, 15, 16, 16, 17, 18 skeins
1425, 1425, 1520, 1520, 1615, 1710 yards

Extras:
QTY (2) large buttons
QTY (4) small buttons