My favourite is the engineering costume! It's really cute, and makes you feel like a *princess* who is also an engineer. I feel like in my mind the Evening Gown is now Zorana's default outfit because I'm always wearing it.
I always look forward to the character designs, and especially the alternative costumes, in games. Overall I think the designs in the game are fine, but unfortunately, I have accrued a bit of fashion school damage. While the faces, hair and bodies of the characters are all very well drawn, I do think the artist has room for improvement when it comes to drawing clothes. With some attention to fashion history, garment construction and proper fitting, their art would go from great to awesome. I know the art isn't going to be changed by now, this is just some friendly criticism for the future.