Framing a Flag

In the case of your own fabric item, I would first take a look at what is commercially available, possibly from some of the suppliers I already gave you, and perhaps from other vendors dealing in framing, etc. I don't really know what is out there "off the shelf" off the top of my head. I am only guessing, but I suspect commercial kits will have you sandwich the flag between the vitrine and backing. This is not necessarily bad I suppose, but it does prevent air circulating. This would be a big problem if you have a mold outbreak, but that is unlikely as long as you don't have high heat and humidity at the same time (65 % and degrees +.) Also this method applies pressure to the flag, especially the fringe, which could permanently deform it

I used to get all wrapped up in doing it the preservation / museum way with my own stuff, until I realized it only had to last as long as I am around to enjoy it! (unlike the museum world, where the goal is "forever.") So a few sensible precautions are in order. First, no matter how you frame it, use UV filtering glass or plastic. And keep it out of direct sunlight. Light, UV and visible, can quickly do damage to any fabric. You cant stop it completely, but you can slow it down. Second, use a reasonably high quality framing material, if wood, and seal it with a good water based sealer. Metal is good too. Third, you will probably have some sort of hard backing for the frame, and be careful there in what you use - plastic or MDF is much better than most plywood (the glues in plywood can be very bad for some materials.) or regular cardboard (if you can get away with cardboard you can use the thick acid free type from one of those suppliers.) For a fabric backing, use something that is relatively inert (natural fibers,) and put a barrier between if you are using a colored backing of some sort. Otherwise, stitch the item to the fabric backing with cotton thread. Leave some room between the item and the glass/plastic.