Detectives working undercover made purchases at Dress for Less and the Hip Hop Connection, The Detroit News reported. The stores were raided last week.
One of the stores displayed what it indicated was a $4,000 jacket on sale for $700, police Commander Steve Dolunt said.
He said the fakes were Chinese imports and had labels like Gucci, Coach and Polo. If they had been the genuine items, they would have retailed for a total of about $800,000.
"People need to understand: If it's too good to be true, it probably is," Dolunt said. "But you get what you pay for, and this stuff is junk."
Four men were arrested during the raids, two at each store, and face criminal charges. The counterfeit items are scheduled to be destroyed.