From the Knit Rowan website:
Knit this womans tee shirt jumper from Rowan Knitting & Crochet Magazine 57, a design by Grace Melville using Original Denim (100% cotton) with lace short sleeves. This knitting pattern has a two star difficulty rating.

Finished chest width dimensions AFTER WASHING:
56: 61: 67: 73: 80 cm
22: 24: 26½: 28½: 31½ inches

Yarn information:
Photographed in Nashville 002
10, 11, 12, 13, 15 skeins
1000, 1100, 1200, 1300, 1500 yards

Gauge notes:

• Denim will shrink in length when washed for the first time. Allowances have been made in the pattern for shrinkage (see size diagram for after washing measurements).
• Before washing using larger needles: 20 stitches and 28 rows = 10 cm measured over stockinette stitch; 20 stitches and 30 rows = 10 cm measured over lace pattern.
• After washing using larger needles: 20 stitches and 32 rows = 10 cm measured over stockinette stitch; 20 stitches and 36 rows = 10 cm measured over lace pattern.