I've got some froggs toggs I bought at our big flea market. They are light weight and keep you dry. I've had some rain gear that after 20 minutes in the driving rain you are feeling the damp working thru. Not with the Frogg Toggs, stay dry as a popcorn fart!!! Not the best for welding though, will burn thru if ol' sparky gets on them.
Like Cactus said, if it's raining get in the truck!
Here's a link,
http://www.froggtoggs.com/