The toggle coat is the best answer to your winter worries. The distinctive features of the duffle coat - the toggles, the roomy cut and the hood - make this outerwear style a cool complement to your laid-back looks.
If you'd rather not spend much, your best bet is this Asos Duffel Coat. It's a great piece, while not very expensive. Another strong contender for your wardrobe is this Asos Toggle Coat. While the price of this product is rather reasonable, it will definitely attract a lot of attention.