There was some confusion in the beginning over the date. They were going with June 9, IIRC, for awhile. George might have been thinking back to that incorrect date and recalled correctly what Caylee was wearing that day. I think it made George look shifty, like he was hiding something, when in reality it could have just been an honest mistake with the date.
But only he knows for sure, I guess.
It almost looks like the whole family collaborated on the original story. KC counted days but still missed the date - the 9th of June was Cindy's idea (at least that's my feeling about it). The clothing could have been KC'c idea simply because she mentioned something about "not having found her clothes yet". The timing of 9-1 pm is also KC's since it matched Tony's schedule. George did what he does best - agree with the women and go with the flow. I honestly don't think he could have remembered all the details. I can't remember what I myself wore last week - forget about a granddaughter's outfit over a month ago. It had to make sense, he knew it, he was a cop. The whole family sat down together trying to come up with a reliable story and they all went with it. Moo