The German military has some literal pullover pant+jacket rain combo. It is quite robust woven nylon on the outside with PTFE membrane below (shielded from the inner garments with thin woven PET). You need gloves to prevent moisture wicking up, and might have to get creative around the face/hood/chin border, but otherwise this (I'd suggest a civil clone; the original seems to only exist in Flecktarn) should do the trick. And it's highly breathable.