Check out this design wall idea. I'll wait. Cool huh? I have a spare, clean, use, shower curtain [I save them, have used them for all sorts of things that need plastic] AND I have the flannel already on the wall. So I need to take it down and sew it to the curtain, then dig up some S hooks, or make them from some leftover wires.....OR...ohohoh.....use shower curtain hangers since I plan to use a stick for the hanging onto part!
What ever I do use will beat just having the flannel thumb tacked to the wall like it is now....I may fill the inside with leftover batt parts instead of the insulation Ms. Mel used, because I happened to have the parts.