I started doing this a couple years ago with black sweaters and now have these short sweaters in about 6 or so different colors. (ladyinviolet.com)
Choose a classic winter wardrobe staple from the chic array of black sweater dresses here. (myntra.com)
With a simple black sweater like this one and this red plaid blouse you can recreate this style and the red plaid blouse looks super cute with just a pair of jeans too. (heartfelthunt.com)