I don't let Rain ,snow or wind stop me from hunting. I just find the proper cover and get comfortable ,I've seen animal's in all sort's of weather so nothing stop's me anymore.
I use Gore -Tex ,and Simpi-Tex and I have some other's as well ,I'm very well prepared for wet weather.

P.S. I definetly agree with Double Creek on keeping your shot's to a minimum of 15 to 20yrds .I've found that directly after a rain deer will move.I've harvested many deer this way .I don't think anyone want's to hunt during a downpour,but I'll go out hoping for a slowing or a stoppage in the rain.

nubo