Some users in many sites wear hats. But it seems in some other sites like Math.SE there to be no hat. So I'm curious about why.
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1They probably did not want any math hatter jokes.– Toon KrijtheJan 3, 2013 at 13:53
2 Answers
Hats are not compulsory.
Some sites didn't sign up to have hats.
Even if a site did sign up you can opt out.
Some sites opted out of the Winterbash, and noone earned hats on such sites.
You'll have to ask the moderators of Math.SE themselves for their reasoning.
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Some per-site metas have questions such as Do we want Hats? on Software Engineering; I don't see one on meta Mathematics though– AakashMJan 3, 2013 at 11:16