Not sure if it is still in print:
CRAFTS OF THE NORTH AMERICAN INDIANS: A CRAFTSMAN'S MANUAL by Richard C. Schneider, Van Nostrand Rheinhold, ca.1970, 325 pages
ISBN 0-442-27442-4
Covers beading, quilling, pottery, birch bark projects, point and tool flaking, tanning, etc. Very instructional yet basic. Does cover patterns and various types of stitching by tribe or geographical area.
Stitching techniques shown for attaching directly to the hide, or by applique. If you're going to do the work yourself, Bill is right in that far easier to stitch the designs on cloth panels and then sew to garment, and just as authentic.
The technique for stitching on hide would take a while to master, as the needle often does not pass through the hide, but pierces just enough under the surface to anchor the beads.