Bidders flipped their wigs Thursday at a Manhattan auction where one of pop art icon Andy Warhol’s signature silver hairpieces sold for $10,800.The wig, complete with three strips of toupee tape applied to its inside, was worn by Warhol during the early 1980s. Warhol first began wearing the hairpieces in the early 1960s, and they eventually turned into fashion accessories more than a cover-up for his baldness. Presale estimates for the hairpiece were $4,000 to $6,000.