A baggy green Australian cap belonging to cricket legend Sir Donald Bradman has sold at auction for almost $100,000.

The cap, which The Don wore in the 1946-47 Ashes series in Australia, fetched $95,400 when it went under the hammer in Sydney, auction house Lawson Menzies said.

The lucky bidder was a private collector who picked up the treasured piece of memorabilia for almost $5,000 under the reserve price, Lawson Menzies sports history expert Tom Thompson said.

The reserve price had been between $100,000 and $120,000.

Also auctioned were red and black race silks worn by Phar Lap's jockeys Jim Pike and Bill Elliot.

But the silks, which had a reserve price of between $70,000 and $100,000, were passed in at $50,000, Mr Thompson said.

"It's nowhere near the reserve price although we think we'll sell it tomorrow because we've had quite a lot of interest," he said.

A bantamweight boxing belt worn by Lionel Rose also sold for $32,197.

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