Light, suitable for bushwacking without
making a lot of noise, waterproof/breath
able.
Or a source for the fabric so I can make
my own.
So far the best I have found is
http://www.cabelas.com/fryprod-0/product–Clothing–Mens-Hunting-Clothing–Men-Hunting-Camo-Rainwear–Mens-Hunting-Pants-Bibs-Rainwear|–pc–104797080–c–104748480–sc–104244480–i–104021280–Cabelas-Space-Rain8482-Ultra-Pack-Rain-Pants-150-Regular–750707.uts.shtml
but it doesn't give a weight.

