I used rain paints (several vendors) when it is cold and wet. I also have a pair of spats (mine are from Carradice) that work much better in warmer weather, but still situations where I don't want my legs/feet to get wet. Also depending upon the weather (cold or windy) I use a Showers Pass Touring Jacket, otherwise I use a J&G cycling cape... For your sizing requirements (4-5XL?); the SPATS/Cape will work (most likely), but for pants/jackets the only vender that will work (that I know of) is Aerotech. I haven't tried their rain stuff, but their other gear is very good.