From the Knit Picks Website:
This zip front cardigan vest combines color and texture with a simple slip stitch technique that requires only one color per row and changes colors every two rows. Edgings are knit in seed stitch. Light, warm layer may be worn alone in cool weather or as an extra insulating layer in colder weather. Palette or other fingering weight sock yarn offers a wide range of color options. Suitable for both women and men. Instructions provided for finished chest sizes 32, 36, 40, 44, 48 and 52 inches.