If you're a thrifty spender, this Asos Hat will fit the bill. It's a foolproof choice, while not very costly. In this price range, you can also check out this Hinge Knitted Hat. It's also a popular item and won't break the bank.
If you're looking for something in between pricewise, you're in luck with this Rag & Bone Knitted Hat in stock and waiting for you. You are guaranteed to love this piece.