There is not much history of the coat on record but there are biographies on Isaac Stevens which may provide information on his coat. I recommend you research "The history of Isaac Stevens' coat." or simply "Isaac Stevens".
Sir Isaac Stevens most likely got his coat from the Nez Perce Indian Tribe at a council meeting.
Joseph the Indian Chief was the Nez Perce leader.
Chief Joseph
no
Chief Three Eagles was a part of the Nez Perce tribe. He was a contemporary of Chief Joseph, living in the early twentieth century.
Chief Joseph the Younger of the Nez Perce
Chief Joseph of the younger of the Nez Perce
Chief Joseph belonged the Nez Perce Tribe of the American Northwest.
Chief Joseph of the Nez Perce Indian Tribe.
Chief Joseph
because they were smart
Chief Joseph