I had a curtain made for my last shop by a boat canvas shop. I had a roll of denier nylon that I had cut into panels and sewn together. It was roughly 30' long. The top was hemmed like curtains in the house and I had big grommets (maybe 1") spaced every 12 inches or so. The bottom was hemmed as well so I could slide scrap metal into the pocket and weigh it down to prevent it from blowing around. I hung it on a vinyl coated cable, one eye on the left, another on the right and a turnbuckle at the end of the cable to tighten it up.
I did it to keep heat in one side of my shop, but I had an unfinished ceiling so the heat just went up and out the ridge vent. It also billowed out more than I liked. When it wasn't in use, I just slid it like a shower curtain up against the wall. I think even with having the material it cost me a few hundred to have it sewn.