OT
On the TV show Rawhide, from the 60's iirc, one or two, maybe 3 of the men, especially iirc Gil Favor the boss, had on their horse what looked like a long canvas bag, where the saddlebags would be if they didn't have a wagon to carry stuff like that. The thing goes from maybe 8" to the right of the horse center line across to the left and down even with the bottom of the horse's belly. Maybe it looks more like draperies, but with no folds except maybe folded over at the front and back. Nothing in the middle.
What are these things called? What do the do?