Quannah Chasinghorse dressing to interpret the Gilded Age outside a Eurocentric lens: https://www.vogue.com/article/quannah-chasinghorse-met-gala-2022

Dentalium shell beads are classic, traditional, associated with wealth and opulence, and were being traded from the west coast to other parts of the continent in the 1800s (into Dakota by the 1860s): https://www.lakotatimes.com/articles/pankeska-pestola-dentalium-shell/

The choker section of Quannah's necklace is similar to the one worn in this photo from 1906.