I'm 6'5", about 200 lb. Eddie Bauer/First Ascent tops in a Large/Tall fit me perfectly. I don't have much in the way of shoulders, though.
As for pants, there are far, far fewer options in my experience. REI's Sahara zip-offs come in several inseam sizes, the longest of which barely fits me. Beyond that, I have to buy XL, XXL, etc., to get things even close to my ankles. I have NEVER seen rain pants in a tall size. When you see "Big and Tall," know the emphasis is on the "and." :-(