If you're budget-restricted, this Columbia Hoodie will fit the bill. It's a popular choice, while not very costly. Another strong contender for your wardrobe is this Kensie Crew-neck Sweater. While the price of this piece is rather reasonable, it will surely attract a lot of attention. You might also want to consider this Anne Klein Turtleneck. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.