Lookups spiked on July 11, 2011.
The word appeared in numerous reports about the British royal couple's visit to North America.
"[Kate Middleton] understands the sartorial demands of her role and how to project her personal taste and even her personality to a world the palace is not yet letting her publicly, verbally address." Amy Odell, New York Magazine, July 11, 2011
Sartorial is a somewhat formal word that means "of or relating to clothes."
It comes from the Latin sartor, "tailor."
Photo credit: Rukia13 / flickr