Leigh & Anders, It's great to have some company, with more yet to join. I would not worry about the authenticity issue, there are a number of photos of Indians wearing civilian clothing. Little hand appears to be wearing nothing more than a vest and shirt. I'm sure a little searching on the net for late 19th and early 20th century clothing will yield results. I will be posting a few pics today but will not make a rush job completing it. Take the time your given and most of all have fun.
This drawing may be of some help when working on the head.~Gary