I can't help you out much with a size comparison to Hollister, but AE's size chart is fairly decent and accurate, so if you can go by that, you'll probably be okay.
As far as fit of of this dress, I don't believe this is in stores yet (at least not mine), so I don't know of anyone who's actually tried it on yet. I also ordered it and it'll be here today, so I can give you a better review of fit after work when I've tried it on