Thorough research has confirmed that it is not possible to view the contents of Elika’s inexplicably constructed shirt. Sadly for the Prince, nothing inside of her garments is an unlockable.
Keep trying, buddy. Maybe next time.
Shamus Young is a programmer and writer by trade, videogame nitpicker by inclination. If you have the patience for more of his ramblings, they can be found at ShamusYoung.com.