I'm on a mission to find out when white women started wearing Plains Indian headdresses as a part of 'fashion'.One of my friends, Ross Chaney, found this gem:
A unusual vaudeville act - USA, 1940s
"Wearing her authentic Native American headdress, Enid Mutterbucket would leap up and down on two mini trampolines, ululating while she performed various movements of an arcane nature. She was accompanied by Signor Prosciutto on his accordion, who played his own arrangements of Lakota folk songs interspersed with popular Glen Miller hits of the day. (Well, I did tell you it was an "unusual" act!)"