Papal conclave: Why do cardinals wear funny hats?

Why do Cardinals (and other Christian priests) wear caps similar to yarmulkes, and what are they called? - Quora

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Fake' bishop gatecrashes top secret meeting as cardinals prepare for pope vote

Argentinian Pope Francis I: Cardinal Jorge Bergoglio elected as Benedict XVI's successor after Vatican conclave - World News - Mirror Online

What's the name for Pope Francis' hat? Papal vestments, explained

Pope Francis creates 21 new cardinals who will help him to reform the church and cement his legacy, News

Pope announces 21 new cardinals for end of September : r/Catholicism

US will have unprecedented voice in electing new pope

Photos of Pope Francis Being Humble