This style of coat was popular with the Métis of the Red River Valley. This particular coat belonged to Alexander Ramsey and may have been brought back by him from an 1851 treaty signing. The coat is possibly Cree, Métis, or Ojibwe in origin.
Members of the Dakota treaty delegation in Washington, 1858. Included in the delegation are members of the Métis community: Antoine (Joseph) Campbell (standing second from left), Thomas A Robertson (standing second from left), and Nathaniel Brown (standing at right).