if you are truly not concerned about the sweat factor, try Burley rain pants. http://www.burley.com/products/raing...Rain+Pants&i=3

I use these when it's really sloppy out. they are totally waterproof. Of course that means you will get wet from the inside unless you take it really easy and aren't riding too far. they also have very nice reflective ankle straps and the fit is designed for cycling.