I've considered going with just a bivy sack type of set-up but as most of my camping is with Boy Scouts and their male leaders (and I'm usually the only female on these trips) I need something that allows me a little wiggle room for privacy for things like changing clothes and such.
Bee used a bivy of the type I mentioned for her overnighter on Whitney a few months ago and she was with a bunch of guys. She should be able to relate how changing inside the bivy works. She might even steer you to some pictures.
