So I was searching around for clothing references for a painting and I stumbled on the photographs of Gertrude Kasebier from the early 1900s. I was so struck by them I printed out several and just started drawing. Here is one of the Lakota men she photographed - from, I think - a western side show. And in my true fashion, I dropped the nose down too far - thus not truly capturing his face. (My youngest daughter pointed it out to me. She has a good eye for that.)
Slightly darkened in the computer, but on my favorite Cagrain paper using faber castell pencils.