Here are some examples of what you might be looking for:
* Brand names: If you're talking about a specific brand of hat, that would be a proper noun (e.g., Stetson, Fedora, Kangol).
* Types of hats: Some types of hats have specific names that act as proper nouns (e.g., Panama, Trilby, Boater).
If you can provide more context about what type of hat you're looking for, I might be able to give you a more specific answer.