We recently did an engagement session with a couple who are fans of vintage 1970s styles. The first thing that came to mind for me was the Ralph Lauren type style in the classic film Love Story with Ali MacGraw and Ryan O'Neal. Ali was certainly an icon of classic American style at this time, and O'Neal wasn't too shabby either.
[youtube=http://www.youtube.com/watch?v=9blFYZArEwA]
Check out the blog Couture Allure for more vintage Ali