There is no source bc it is wrong. East Asian countries for example oftentimes didnt have a crown like equivalent hat with same importance.
Chinese empires for example saw the robe as much more important. Usurpers would be indicated by having a emperor robe, not crown. And there are other symbols. All of them more important than the emperor hat
Does everyone in the comments know this is true or just assume its true? OP please share sources for the rest of us.
There is no source bc it is wrong. East Asian countries for example oftentimes didnt have a crown like equivalent hat with same importance.
Chinese empires for example saw the robe as much more important. Usurpers would be indicated by having a emperor robe, not crown. And there are other symbols. All of them more important than the emperor hat