I always like Scarlett Johansson. She can be compared to the classic Godess of Hollywood when she is shot in black and white. Lots of today's actress lose their edge in black and white photos.
She has something innocent and serious in her that does not match a cheap and deperate blond girl, which she become in the end of this film.
White shirt is sexy though. A real good white shirt just screaming classy and sexy. And Johannsson's first apperance with white shirt on, playing ping pong, with her hair up, is the best of her in this film.
Remember seeing her in Lost in Translation and loved her, that no make up and all natural girl with potential of being a real beauty someday.