I wear a WPB safety parka Firengine neon lime with wide reflex bands , and 3 layer GTX trousers. in the winter.

A rain cape is generally a cone shaped thing. long enough to drape over the handlebars, and cover your backside..

with fenders no wheel spray, and lots of ventilation as there is a tent effect behind your arms ..

Campmor in NJ sells one pretty cheap , yellow.. has a hood.

you can get a cheaper one made for all those Chinese riders to use, domestic product .
if you can get one mailed, from there.