I use a tourmaster defender 2 piece rainsuit - seems OK. They are available mail order.
I prefer to change into my smart stuff once I get to work, rather than crease everything up under my bike gear. I also have to keep my shoes very shiny,

so I leave those at work.
link to one place that sells these, but they seem readily available
http://www.shadetreepowersports.com/...onthsBetween=0