I was going to suggest something similar - old school PVC rain gear.
One nice thing about PVC rain gear is that when you cut it, you can hem the ends by folding over and using PVC pipe cement (also available at HD) to glue it.
Or how about a cycling poncho: http://www.rei.com/product/853869/novara-fells-point-bike-poncho-womens
If a poncho works for you, then this is a nice long-lasting solution. Cyclists love ponchos due to the fact that you sweat less in them. They also have the advantage of being much easier to get in and out of...
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One nice thing about PVC rain gear is that when you cut it, you can hem the ends by folding over and using PVC pipe cement (also available at HD) to glue it.
Or how about a cycling poncho:
http://www.rei.com/product/853869/novara-fells-point-bike-poncho-womens
If a poncho works for you, then this is a nice long-lasting solution. Cyclists love ponchos due to the fact that you sweat less in them. They also have the advantage of being much easier to get in and out of...