A general term for a hat, typically one with a brim, as opposed to a cap (キャップ). Used in both casual and formal contexts.
He went out wearing a black hat.
He went to the party wearing a new hat.
He took off his hat when entering the room.
hat trick
top hat; silk hat
hi-hat; high-hat
opera hat; collapsible top hat
top hat
Borrowed from English 'hat'.