If you're a thrifty shopper, this Jules Smith Designs Scarf will fit the bill. It's a popular choice, while not very pricey. Another strong contender for your wardrobe is this Sperry Scarf. While the price of this item is not too high, it will surely attract a lot of attention.
If you can afford to spend a little more, look no further than this Marc by Marc Jacobs Scarf. This item doesn't cost the earth, but absolutely essential in your wardrobe.