Possible Duplicate:
Are there any secret hats?
When I was collecting my hats on Stack Overflow I just came across a link that shows all the hats for users but some of these hats are not available in the winterba.sh. Are they available for other Stack Exchange sites likes security, superuser, etc.?
Some of those are secret hats as mentioned in comments. The more active you are, the more chances are that you might get it. And that list doesn't represent all of the hats(For eg:- the pirate hat is not present there).
Most of these hats should be available in other sites as well. Check the Winter bash leaderboard to see some of the hats that are uncovered till now.
