A former NYPD sergeant who sold out to a crack dealer for a pair of sneakers and a warmup suit will be getting new duds - courtesy of the prison system.

Roosevelt Green was sentenced Tuesday to six months for helping the Long Island drug pusher with license plate checks on undercover vehicles.

Green ran plate numbers on a police computer in his NYPD car at the 62nd Precinct in Bensonhurst, Brooklyn - then gave the registration addresses to Frank (Big Banana) Wilson, according to court papers.

Later, Green was caught on a wiretap giving the drug dealer a shopping list. "I'm gonna need a nice warmup suit and a pair of white tops, okay?" he said.

He told the feds he bought clothing and sneakers from the crack dealer and didn't get them for free, prosecutor John Durham said.

The ex-cop, who pleaded guilty last year, was hoping for no jail time, but Federal Judge Joseph Bianco noted that he jeopardized a major narcotics investigation and put law enforcement officers in danger.

"Law enforcement officers have the responsibility to serve the public and protect their communities," said Brooklyn U.S. Attorney Benton Campbell.

"This defendant abused that responsibility and used his position to obtain sensitive information that he provided to a known drug dealer."

Green, 47, resigned from the NYPD before he could be fired. Defense lawyer Anthony Ricco said the sergeant was remorseful for his "incredibly idiotic" actions.

The father of six is now working in asbestos removal for his brother's company.