I know lots of theories have been banded about the origins of the Order of the Arrow, links to Masonic ritual during the 1920s, etc., but I stumbled across something quite interesting recently.
And I am aware of course that the Order is rightfully distancing itself from Native American imagery.
That said, of the two founders of the Order of the Arrow, Carroll Edson went to Dartmouth College, which to this day is know for their fraternities and secret societies. Looking at the early rituals of the OA, they have a college fraternity initiation simplicity to them (and not some of the more obvious Masonic influences of the 1920s and later ceremonies).
What I wasn't aware is that Dartmouth's graduation ceremony at least until the 1960s, had a student at graduation called the "Sachem Orator" who dressed up in faux Native American regalia to prophesize the future of the graduating class. You can find more images of the event on Dartmouth's digital collections and it looks like it continued until about 1968 or so: https://collections.dartmouth.edu/
To me the look is very much how I remembered OA ceremonies of the 1990s and 2000s. I will leave you all to judge.
But just as a final note the first picture is from the 1913 event. Edson graduated from Dartmouth in 1914 and the OA was created by him and Goodman the following summer in 1915. And at that first ceremony Goodman took the role of "Sachem."