For doing #2 with minimal exposure to the elements:
the farmer johns, long johns rear flap, aka Red union suits, or drop seat back...
There is no mazey slot for #2. it's a couple of buttons or velcro, on a square rear butt flap. I spend an entire 30 secs to find these style designs."
You are not paying attention! I've been telling you I HAVE some Patagonia tights/long underwear with a rear fly that is fashioned (inexplicably) exactly like the usual *overlapping* style we have been talking about. Exactly, except they are a bit bigger, say about twice as big.
I am tempted to send you a picture, but I feel I need to know someone better before I send them photos of my underwear. Paying attention when I talk might be a good start. *sniff*