This is a 4 ply waist length cardigan.  You can knit it as I have done, with no front, like a shrug, or with a V-necked front.  Most 4 ply yarns are suitable, you may have to adjust the KM tension - I knitted it in Shamal and used T6 [the pattern says T7, which I would use with Superwash wool]

Click on the picture for the pattern