There are several on-line fabric supply places that have material for breathable auto covers, marine/convertible tops, etc. Here's one that seems to have a bunch of alternatives. SeaMark™ Waterproof Fabric, Awning Rail, Boating and Marine, Aqua Gun - Solution Dyed Polyester, Aqua King - Vinyl Coated Polyester from Rochford Supply - Your Online Textile and Upholstery Superstore! You might visit your local interior supply company and see what they have, too? For your use, emergency cover for shows, etc when you get caught in an unexpected shower you're not so concerned with breathing & chafing from wind/movement over time.