Sean “Diddy” Combs was back in his beige jailhouse duds at a Manhattan court hearing Thursday — as legal filings revealed the rave reviews his lockup business class received from fellow inmates.

The salt-and-pepper-haired rap mogul, 55, who wore a revolving roster of sweaters over button-down shirts at his salacious sex crimes trial this summer , sported drab Correction Department-issued scrubs as his lawyers made a long-shot bid to toss his case before next week’s sentencing.

Combs’ 90-minute Manhattan federal court appearance came as his neighbors at the Metropolitan Detention Center — including an accused heroin dealer and alleged violent pimp — wrote glowing letters praising a supposed entrepreneurship class he taught in lockup called “Free Game With Diddy.” 3

“He has showe

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