I don't own a cardigan but I keep looking at these Barbas. I love their shirts. I can't find a pic of an actual person wearing this or something similar, but I know I've seen someone here wearing one very similar, maybe in the thrift thread.
Anyways, I would wear it over a button down with jeans or chinos mostly.
I find the weave pretty interesting, but not sure of the arms being contrast/plain. Can't tell if this is too hipster or maybe Mr. Rodgers.