When it comes to wet weather there is no better than the ECWCS (extreme cold weather clothing system) Gore-tex parka and Gore-tex pants.

They offer great rain protection as well as from the wind. You can also use them during the summer months because the parka and pants do not add any heat value. To revive the waterproofing use Gear Aid ReviveX Durable Water Repellent For Outerwear http://amzn.to/2DkhPT5