Gawker has honed in on this one, which is of interest to us as well, with a post titled “What is Mary Romney Dressed Up as in this Picture?” and goes on to speculate:
A brief survey of the Gawker office yielded the following guesses:
• “Girl who lives in Williamsburg circa 2009″
• Mountain Meadows massacre participant
• Native American
• Something from a Stephenie Meyer novel
• Brunette hippie (Mary is usually blonde)
For more on the subject, see Republicans Want to "Keep America America" and Romney Associates with Bigot Fischer.