You'd think that type of costume would be saved for posterity by someone, perhaps George Lucas himself. Nope! They gave it away, and not even to some crazed Star Wars fan who would preserve it in a bulletproof walk-in humidor. After filming had wrapped up, Obi-Wan's robe was sent to a costume shop in London and stored with a bunch of other monk costumes. People could rent it out for movies or costume parties or, we guess, joining a convent and praying. Someone probably tried to rent it to go as Obi-Wan one Halloween, but everyone thought it was a hobo costume (well, they weren't completely wrong). Even worse, it was once rented out as an extra's costume in The Mummy. The store had no clue what sacrilege they were committing.
It really does raise the question of how many people were renting monk costumes. Is there some sort of cult scene in London that nobody's paying attention to? Regardless, the Kenobi Robe-y finally got its due after a routine
dress-up day inventory check in the costume shop revealed the history of the garment, which proceeded to sell for $80,000.