Feel free to leave some of your own suggestions!
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Pirate hat
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Fez hat
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Ten gallon hat
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Dice head
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Foam finger hat
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Bucket hat (not an actual bucket)
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Golf cap
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Boot hat
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Shark bite hat
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Fish hat
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Russian hat
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Horse mask
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Beret
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Umbrella hat
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Colonial hat
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Crusade helmet
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Skate helmet
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Soldier helmet
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Raccoon hat
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Dog ears
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Bear ears
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Ogre ears
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Respirator
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Hygiene mask
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Bongo hat
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Sailor hat
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A stack of everyday objects
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Underwear