A Cycling Rain cape is Cone shaped, and makes a tent that covers your legs
by being supported by by your outstretched arms, a helmet raincover is a good thing too.
Campmor has the capes for just $35.
you can wear your layers of woolly warm stuff underneath ,
the air circulating under the 'tent' is letting the heat of the riding out well enough.

that an a pair of rubber boots and that should get you thru a lot..