From the Knit Rowan website:
This mens shawl collared cardigan from Rowan Knitting & Crochet Magazine 59 is worked in the classic Original Denim yarn. Designed by Sarah Hatton it also simple patterning based on traditional ganseys.

Finished chest width measurements:
54.5: 57.5: 60.5: 63.5: 65.5: 68.5: 71.5 cm
21½: 22½: 24: 25: 26: 27: 28 inches

Yarn information:
Photographed with Rowan Original Denim in Memphis 001
16, 18, 18, 21, 22, 22, 24 skeins
1600, 1800, 1800, 2100, 2200, 2200, 2400 yards

Extras:
QTY (6) BN1470 buttons from Bedecked

Gauge notes:

• Before washing: 20 stitches and 28 rows to 10 cm (4 inches) measured over stockinette stitch.
• Machine wash all pieces before completing the sewing together.
• Denim will shrink in length when washed for the first time. Allowances have been made in the pattern for shrinkage.