If you have a pair breathables and a pair of neoprenes that you thought were beyond redemption, you might want to try this.
Just cut the feet off your leaky neoprenes and wear them under your breathables, assuming they will fit of course. My current pair of breathables are too tight to allow this (fat bastard), but I saw a guy using this trick on the Clyde last winter and thought it was a good idea. You can cut a fly for peeing through and could cut them off at the waist too, I suppose.
Alex