I am 6'4" in a M3W and use a Hedon Hedonist 3/4 helmet with either a pull down face shield (great for flipping up to answer questions at stop lights) or the more traditional bubble face shield. The Hedon has a great classic look, is light, stylish and safe.
Hedon Hedonist Helmets

For rain gear, I keep a pair of lightweight motorcycle rain jacket and pants in the boot. Great in a pinch, but I've also been soaked a couple of times as well. Enjoy the experience, I love it all! smile