This pattern is divine! I have absolutely no idea why the sleeves on the cardigan aren't patterned but it is what it is, we can do what we want, and King Cole can't stop us! God, we think this is gorgeous. It's busy without it being too much. I'd shorten it, I'd make it oversized... it's just amazing.
This has been knitted in King Cole Merino Blend DK, a great value yarn with a merino wool content. You can use any King Cole DK yarn though. You'll need 3.75mm and 4mm needles, along with buttons for the cardigan.