William Jones, 73, of Everett, said he designed his first pair of Winkers, which use the crease between a wearer's buttock and the top of the leg to create animated images, as a pair of winking eyes a few years ago, the Everett (Wash.) Herald reported Thursday.
Jones said his Web site for the product has amassed more than a quarter-million hits since it went live less than a week ago.
"We're swamped," Jones said. "It caught me off guard. I wasn't ready for what happened."
Jones said he created each pair of Winkers by hand in his living room. He said it can take him up to 10 hours to complete a single pair.
Winkers start at $159 for the basic winking eyes and reach prices of $579 for more elaborate designs.