One thing I particularly like about Amidala's costumes is how they evolved with each movie to reflect the character. In the Phantom Menace, she was royalty, majestic and slightly aloof; her clothes were highly structured and detailed. As Senator Padme in Attack of the Clones, her soft, romantic look revealed her emerging feelings for Anakin Skywalker (her wedding dress was stunning). Lastly, in Revenge of the Sith, her flowly dresses were necessary to hide her pregnancy.
The Phantom Menace:
Attack of the Clones:
Revenge of the Sith:
Yves Saint Laurent even launched a range of cosmetics in 1999 inspired by Amidala:
Photos courtesy of natalieportman.com