Yes but the handbook didn't come out until 1980 and those photos were taken in 1965. It was more of an obscure subculture prior to the 80s after which it became more mainstream because of the book and subsequent use in films. I'm sure there was a certain amount of pressure to dress alike in the 1965 photos (not simply as preppy but I think looking "clean cut" in general was part of the American norm) so it can't be said that their style isn't completely contrived, but I think it was probably more of a reflection of their lifestyle or simply habit back then. I mean I'm sure if those pictures from the Take Ivy photos were taken today it would probably look only slightly different (as preppy style doesn't really change) but everyone would've said something like "

so predictably J.Crew!".
I guess what I'm saying is that when someone attempts this look today, it usually lacks authenticity. There's an article by one of the people that helped put the original Preppy handbook together, entitled "We're All Preppies Now" which I found interesting:
"Today, though, I think the unself-consciousness that used to distinguish the preppy world is gone. When
anthropologists study a tribe, however respectfully, they change it........
Maybe the little plaid book was the serpent in the Garden of Eden or maybe that was Ralph Lauren, but in the
1980's the preppy uniform became just clothes. Here's how you can tell: Mr. Lauren had a bad habit of putting his
monogram on everything and nobody complained except my mother. The sourcing patterns for the lifestyle got blown
open. A department store chain bought Brooks Brothers. L. L. Bean went from being the store in Maine where you
got those lace-up boots to a national brand. People who'd never been on a dinghy started calling their raincoats
"foul weather gear." Cable-knit sweaters went mass-market.
There were lasting repercussions: the polo shirt and khakis entered the national clothing vernacular and allowed
Casual Friday to exist. Chains like Abercrombie & Fitch, which originally sold arcane hunting gear, expanded into
shirts that exposed girls' bellybuttons.
"Preppy" became a style choice like Goth, a high-school cafeteria
category. The clothes that had once signaled membership in the shards of the WASP ruling class became a
costume. "Preppy" became a style choice like Goth, a high-school cafeteria category. The clothes that had
once signaled membership in the shards of the WASP ruling class became a costume. "
I especially agree with this last bit, but the whole article can be found here.
http://www.nytimes.com/2005/10/24/o...e524616cd&ei=5090&partner=rssuserland&emc=rss