From the Knit Rowan website:
Knit this womens stocking stitch vest from the Truesilk Collection, designed by Martin Storey using the divine yarn, Truesilk (mulberry silk). With garter stitch edgings, round neck and front neck opening detail, this knitting pattern is suitable for the intermediate knitter.

Finished width dimensions:
44.5: 48.4: 55: 61: 68 cm
17.5: 19: 21.5: 24: 27 inches

Yarn Information:
Photographed in Joy 338
5, 5, 6, 7, 8 skeins
820, 820, 984, 1148, 1312 yards