Headwear by Opening Ceremony
If you are on a budget, this Opening Ceremony Beanie Hat will fit the bill. It's a great choice, while not very expensive. Another strong contender for your wardrobe is this Opening Ceremony Hat. While the price of this piece is not very high, it will certainly attract a lot of attention.
For something in the middle of the price range, look no further than this Opening Ceremony Baseball Cap. This item doesn't cost the earth, but absolutely essential in your wardrobe.
If you're looking at it like an investment piece, then what you're looking for is this Opening Ceremony Hat. It's more expensive but worth your money.