For her birthday this year, Mom pointed to a flute bag in the Crazy Crow catalogue and asked for one to fit hers (a concert flute somewhat too long to fit into the one they offer) for carrying to Market Day and other local vaguely Colonial events.
I made this one from a split, chrome-tanned garment buckskin with a dark red, hard-faced cotton twill lining to keep the weight from stretching and bulging the leather, and prevent too many shed leather fibers from getting into the instrument's workings. The fringe is some large straps of leftover German-tanned buckskin. The bag is folded and sewn inside-out with the fringe facing inward and the lining on the outside; when it's turned rightside-out, the fringe now sticks out and can be cut into strips.
The drawstring and shoulder strap are more German buckskin, but the small bits connecting the strap to the bag are a much denser, tougher chrome-tanned cowhide. I handmade two pairs of soldered brass D-rings to attach the shoulder strap to the bag at the correct angle. The cowhide bands are secured with tin rivets and steel washers; I would've preferred copper, but the hardware store didn't have any that were short enough.
One improvement I'd still like to make would be to line the shoulder strap with a smooth leather so it won't shed fibers into one's clothing.