From the diary of Megan:

Once I had pulled the entire dress from the box, an eerie feeling, one which made me think I had worn this dress before, seeped into a small part of my mind. Because I also knew that I had not even seen the dress until I opened the box, such a thought was impossible, or so I was quick to believe. When the governess saw me hesitating, she asked me if I was gonna stand there all day, or try the bloody dress on, so if it had to be returned, due to the fact that it didn't fit, or I didn't much care for it, such a thing could be accomplished well before dinner this evening.

It was a good idea to me, so I acted upon it. When the governess had zipped and tied me into the dress, she said the exact same thing which I had already thought about, the dress was somehow meant to be worn by me, because it seemed to be one which I had worn prior to this moment. When I asked her why she had said that, she said that she had seen a picture of a fairytale princess, when I was wearing the dress, it was as if I was an exact match for the girl in the picture, rather than ask her to explain further, I accepted what she was saying.