You can make your own brush pants with gorilla glue.  Take an old pair of jeans you dont mind ruining.  put something in the legs so they dont glue to one another.  Pour gorilla glue on jean surface and spread about with a disposable puddy knife.  You spread all over in a pattern resembling  that of if you were wearing chaps.  No need to go any higher than thighs.  you may want to leave a small unglued strip across the knees so they bend easier.  Let cure and your ready to hunt.  You find them stiff but flexible and repel water.