However, the most iconic one is likely the white strapless ball gown she wears for the grand ball. This gown, designed by Bob Mackie, is a stunning example of the classic Hollywood glamour of the time. It's known for its dramatic shape, fitted bodice, and flowing skirt.
If you can provide more context (e.g., a specific scene or a description of the gown), I may be able to give you a more precise answer!