Used to have to hunt when I could get off, rain or shine. Now I can be a bit pickier. Still, I think hunting in a steady drizzle or even light rain is very effective. Rain and wind together are the pits.
Don't have "rain gear" per se, but I do have a couple of waterproof coats that keep me dry and warm. Wool is good too in light rain. The problem I've had is that pants that aren't waterproof channel water down my legs into my waterproof boots (no, I don't tuck them in).
When stand hunting, aloft or on the ground, one of the tree umbrellas is great to have if there's no wind. Even a pretty hard rain can be bearable with one of those.
