Full Mudguards, + a Cycle Rain Cape .. I have dry hands as the cape covers them.
arms outstretched form an Awning for my legs..

Shape is a Cone rather than a square like a Poncho, so not much Flapping as you ride..

J&G , Carradice, Pro Route, are good .

Mine, Grundens, made for Rivendale bike works, is heavy duty.

Helmet-cover (instead of helmet light)