If you are on a budget, your best bet is this Kate Spade Knitted Hat. It's a wonderful item, while not very pricey. Another strong contender for your wardrobe is this Coal Beanie. While the price of this item is rather reasonable, it will certainly attract a lot of attention. You might also want to consider this Barefoot Dreams Knitted Hat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you want to treat yourself, then you won't be disappointed if you check out this Saint Laurent Knitted Hat. It's a costly but smart option. While you're at it, also have a look at this Burberry Hat. Yes, this item is expensive, but it does not mean it's not worth it. And how about the luxurious Eugenia Kim Hat? Yolo, right?