A hat is a head covering. It can be worn for protection against the elements, for ceremonial or religious reasons, for safety, or as a fashion accessory.

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Winter Bash 2015 - the Hat Competition

The last three years UX.SE participated in Winter Bash, which lets our users earn and wear hats on their user profile image. You earn hats through participation in asking questions, answering ...
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Do we want hats?

A year ago Stack Exchange ran a Hat promotional event where you could earn "hats" for your gravatar (profile icon) to wear. Stack Exchange is going to do a second run of this promo, but they're going ...