Tax police said they seized garments and watches Wednesday, as well as fake documentation. The said the line was to be launched in Milan next week.
Police said the probe stemmed from a complaint filed by the actor.
"If someone tries to sell you clothes or watches that are based on me, don't buy them," Clooney, 46, told reporters Wednesday in , where he was promoting his new film, "Leatherheads."
Organizers of Australia's fashion week had planned to make 14-year-old Polish model Monika Jagaciak the star of its annual fashion shows from April 28 to May 2.
But editors from Vogue magazine and Marie Claire threatened to pull coverage of the fashion events and called for Organizers to follow guidelines in place in London and Paris, which place restrictions on models under 16 years old.