Well, the auction took place yesterday, and the results are in:
Cloak worn by Alec Guinness as Obi Wan Kenobi from Star Wars - sold for £54,000
Dinner suit worn by Sean Connery from Thunderball, 1965 - sold for £33,600
Full outfit worn by Mel Gibson as William Wallace in Braveheart - sold for £25,200
Promotional costume worn by Tom Baker as Dr Who - sold for £24,600
A grey linen overcoat worn by Gary Oldman as Sirius Black from Harry Potter and the Prisoner of Azkaban - sold for £15,600
Fur Coat worn by Diana Rigg from On Her Majesty's Secret Service - sold for £12,960
Navy Battle dress jackey worn by Roger Moore from The Spy Who Loved Me - sold for £11,760
Batman & Robin suits worn by David Jason & Nicholas Lyndhurst in Only Fools & Horses - sold for £10,200
A full medieval suit worn by Kevin Costner in Robin Hood Price of Thieves sold for £7,200
More details are to be found at Bonhams' press release.
As a side note, looking at this page in Bonhams' catalogue, also associated with the sale, it appears that some of the costumes were modeled. Oh, to wear some of those outfits, even for a few minutes, and get paid for it!!