The distinctive leathers worn by the greatest road racer in history are expected to make £20,000 when auctioned on Monday.
Joey Dunlop wore the leathers, along with the gloves, boots and trademark yellow helmet also included in the lot, when he won his 23rd Isle of Man TT victory in 1998.
The Ballymoney rider won a record 26 TT races in all, but the 1998 Lightweight event was the first time he lapped the mountain course at an average speed of over 100mph.
Dunlop, 48, was killed while competing on a 125cc machine in Estonia in July 2000.
A Sotheby’s spokesman told the BBC it was “incredibly rare” to see a complete outfit worn by the “sporting great”.
The outfit will be sold by Graham Budd Auctions at Sotheby’s New Bond Street in London.