I have to admit the costume that took my breath away wasn't the most spectacular or elaborate. I've always loved the movie Howard's End - E.M. Forster is one of my favorite authors, I've had a long-standing obsession with Merchant Ivory films and I just lurve Emma Thompson - so encountering a dress Emma Thompson wore in that film (below) made me tear up just a little bit. That emotional response was surprising. I think it was a result of encountering such a familiar item from fantasy unexpectedly in reality. I even considered snapping a clandestine picture of the dress, but didn't feel confident in my sneakiness, so I didn't. Maybe I'll have to go back before the exhibit leaves, just to visit Margaret's dress one more time (and to check out Captain Jack Sparrow's outfit, as well. You know, as long as I'm there).
If you can't get to the exhibit, but would like to see some of the costumes in more detail than what is in the video, I just found a Flickr set by annesstuff which shows many of them when the exhibit was in another venue.