response: I don't really know, but it's a knitted sweater with an open front.
original_response: The old version is the regular one, knitted garment that has open front and buttons!
history: I like wearing cardigans, they make me feel fancy. Do you know anything cool about them? One thing I know is that there is a modern version that doesn't have any buttons. I didn't know there was a modern version and an old version, what was the old version like?
knowledge: A cardigan is a type of knitted garment (sweater) that has an open front.