A feathered headdress is read as honour, earned respect and a role carried with dignity. Many cultures treat it as sacred, so in dreams it is taken as a symbol of responsibility rather than costume.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.