United Kingdom, June 13 -- Donald Sutherland attended a Pride + Prejudice cast party in a gas mask.

The late screen legend - who died a year ago aged 88 - had a clause in his contract that nobody be allowed to smoke cigarettes anywhere near him but he relaxed his rule to hang out with the rest of the stars on the 2005 period drama by taking his own precautions.

Discussing her favourite memory from making the film, Keira Knightley told Vanity Fair: "There was the party that Donald Sutherland came to.

"You weren't allowed to smoke. He had it in his contract that nobody on the set was allowed to smoke anywhere near, and you couldn't smell of smoke.

"But of course everyone smoked back then. And everybody would be smoking, and then you'd b...