I've thought about this way too much, but if I could have one from each decade:
1910s: Musidora
1920s: Clara Bow
1930s: Marlene Dietrich
1940s: Ida Lupino
1950s: Anita Ekberg
1960s: Claudia Cardinale
1970s: Soledad Miranda
1980s: Geena Davis
1990s: Sherilyn Fenn
2000s: Mia Kirshner