If you'd rather not spend much, your best bet is this Hat. It's a wonderful product, while not very costly. In this price range, you can also take a look at this Dondup Hat. It's also a popular item and won't break the bank. You might also want to consider this Altea Hat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking for something in between pricewise, look no further than this Mühlbauer Hat. This item doesn't cost the earth, but absolutely indispensable in your wardrobe. It's also worth looking at this Dsquared2 Hat. This piece is extremely popular and, just as importantly, not too pricey. Look at this Hat too! Great value for your money.
If you're gonna splurge, why not opt for this Hat - a great luxury choice. Another product we're drooling over is this Off-White Hat. It's costly but you get what you pay for. You might also be interested in this Brunello Cucinelli Hat. You won't regret the money spent!