"I pounced on these sweaters," she said Thursday, adding she figured they could help a charity named for her brother, Ennis, raise a substantial amount of money.
Now three of them are going up for sale on eBay, with the proceeds earmarked for the Hello Friend/Ennis William Cosby Foundation.
The nonprofit organization, which raises money to benefit educational programs, is named in honor of Cosby's only son, who was about to begin his doctoral studies when he was murdered in Los Angeles in 1997.
The auction is scheduled for June 2-12, with minimum bids set at $5,000.
"The price of what some of these sweaters might sell for could make a big difference in the lives of thousands of children," said Evin Cosby.