Nice find Captain Forrest! Yes, I believe that is their equivalent of a Gore-Tex winter parka.
Their rainsuits are thinner, and have a simpler cut and non-removable hoods. The fur I believe is rabbit, though it might be a high quality fake fur. They have the same type on their winter caps.
And yes, the hoods are greatly oversized to fit over helmets. You can particularly see them worn by DMZ patrols in the mountainous areas during winter.
They have a removable electrically heated liner, and the fur trim is removable from the hood.
I don't think the ROKMC has a WAVEPAT equivalent, or at least I've never seen one in a photo or in a collection.