From the Knit Rowan website:
Knit this women’s stocking stitch vest from the Cotton Lustre Collection, a design by Sarah Hatton using the beautiful yarn Cotton Lustre (cotton, modal and linen). The main body is knitted in stocking stitch with patterned detail on neckband, armhole border and welt, with V neck and longer back hem, this knitting pattern has a two star difficulty rating.