Tricky thing to wear? (3)

I believe the answer is:

hat

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'wear?' is the definition.
(hatting is a kind of wearing)

I don't understand how the rest of the clue works.

(Other definitions for hat that I've seen before include "Cap" , "Bowler maybe" , "Accessory" , "Headwear" , "Headgear decoration" .)

I've seen this clue in the Evening Standard.

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