Kristin Scott Thomas took a break from filming to attend the Giles Deacon show, but she won’t have any trouble slipping back into her period costume on the set of “Bel Ami,” an adaptation of the 19th-century novel by Guy de Maupassant. “I quite like wearing corsets,” the British actress mused. Her co-stars include Uma Thurman, Christina Ricci and Robert Pattinson, but Scott Thomas said she had seen no evidence of the “Twilight”-induced hysteria that Pattinson routinely unleashes. “I keep hearing he’s fantastically megafamous, but you wouldn’t know it. He doesn’t have hundreds of people trailing him,” she said.