went from a regular Outdoor back packers parka, Marmot/etc.
to one from Carhartt .. roadside worker's gear
a Dweeby neon lime, ANSI reflective tape on the body and arms,
for the fog & light drizzle ..
but when the sky kicks in with a shower mode,
I get out the Grunden's made Cycle rain cape
and pull it on over my parka with the hood up,
or the SouWester, like the guy at the old sail helm.
http://www.rivbike.com/product-p/ar1.htm.
Big benefit of the rain cape , is it drapes over my hands, so they stay dry..
better than any sewn gloves .

You in Metro Seattle would probably be wearing a helmet with a helmet cover on it.
would have to take off the helmet to get the cape over your head.

cycle capes like the 'bumpershoot' er umbrella,
is open underneath so breathability is not an issue
though it physically is 100% waterproof, welded seam PVC/nylon.