A: A oversized, hideous looking sweater with ugly patterns and colors, often worn by old men or hipsters with no taste.
B: A sweater a senile colorblind person would pick out.
As referenced in HIGH FIDELITY
: "That's a COSBYYYY SWEATAAH, a COSBBY SWEATAAH!" - Jack Black
"Aww look at that sad sweater, did your mom pick that out for you?"