She probably doesn't have it yet, as a lot of people spend quite some time picking one out (unless they have a sort of heirloom thing that gets passed down). I'm guessing she'd also like to keep that to her family for a while as well before any pics.
No heirloom I'd fit in...My mom was a size 2-4 when she got married. That is NOT happening =P Wedding dress shopping isn't done until later in the planning process, but I do have some ideas in mind. I can't post my choice publicly until after the big day or a snooping Moose might see. I buck tradition on a LOT of things, but that's not one of them. He'll get to see the day of and not a moment before.
i have a beautiful unworn wedding dress if you want (only partially kidding haha need to get rid of this thing XD XD)