In 1965 the Japanese magazine publisher Fujingahosha published Take Ivy, a book of candid photographs of the students and campuses of America's Ivy League universities. The shots focused on the men and their clothes and set off a trend of American "Ivy Style" in Tokyo. The book was re-editioned in Japan in 2006 and sold out immediately. The first English language edition of the book was recently released by Brooklyn-based powerHouse Books. The New York Times is calling it "a treasure for fashion insiders."
A follow-up to the 1965 book, Take Ivy 8, is in the works.
And here's a good article from the New York Times about prep fashion and the Take Ivy phenomenon.