Here is a cape to knit in stockinette stitch and garter stitch with Lang Yarns Ario knitting yarn (66% merino wool, 29% nylon, 5% viscose) in your choice of color, 0087 shown.
Quantities to knit are:
Lang Yarns Ario 0087
S1: 6 balls, S2: 8 balls.
Knitting needles 4.5 mm (US 6 / UK 7) not included with the yarns. The knitting yarn kit includes a copy of the pattern.