If you're not planning on spending much, your best bet is this San Diego Hat Company Hat. It's a fantastic piece, while not very pricey. In this price range, you can also look at this Michael Stars Hat. It's also a popular item and won't break the bank. You might also want to consider this Vans Hat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you can afford to spend a little more, take a look at this Eugenia Kim Hat. While the price is very reasonable, this product is an easy wardrobe update.
If you have enough to afford it, then you won't be disappointed if you check out this Eugenia Kim Hat. It's an expensive but smart option. While you're at it, also have a look at this Eugenia Kim Hat. Yes, this item is expensive, but it does not mean it's not worth it.