Wilt Chamberlain's two-piece disco suit, worn by oner of the coolest athletes of all time, is on the block at SCP Auctions ... and is expected to sell for a pretty penny (bids start at $20k)!

SCP described the suit as one of the "most unique" items from the Big Dipper ... a fit he not only wore on multiple occasions including during a visit to the Playboy Mansion, but he was also photographed in the threads over the years.

The blazer and pants are in "wearable condition" and come with horse hair and feather tassels attached. Instead of buttons, the designer used stones and leather.

"This suit certainly aligns with Chamberlain's larger-than-life attitude," SCP said, "and can be photo-matched to multiple images of Wilt enjoying the nightlife in the 70s."

SCP got its hands on the rare fit from a private owner who obtained it at auction in the early 2000s.

Of course, anything worn by Wilt is gonna cost you ... the Philadelphia-born baller, a 4x league MVP, is considered one of the greatest to ever play the game of basketball.

Wilt earned many accolades during his 14-year career. He made 13 All-Star teams, was a 7x scoring champion and 11x rebounding champion. He won 2 NBA titles and was the Rookie of the Year. Chamberlain could do whatever he wanted on the court.

Off the court, Wilt was known for his alleged exploits with the opposite sex ... claiming to have slept with over 20,000 women. With the disco suit, we're inclined to believe him.