Wearing a hat; described as having on a hat, especially when the hat is noteworthy or formal.
Be- (covered with, having) + hatted (from hat + -ed suffix). The be- prefix with -ed creates an adjective meaning 'wearing' or 'covered with,' common in compound adjectives like 'befuddled' or 'bemused.'
Behatted shows up in old literature to describe formally or elaborately dressed people—it's charmingly specific, like saying 'hatted' wasn't enough and you needed 'be-hatted' to emphasize the formality of the headwear.
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