Bollywood superstar Aamir Khan, who was recently in Varanasi for the promotion of his much awaited film 'PK', purchased a Banarasi sari from there for co-star Anushka Sharma, as a special souvenir. After spending hours going through a huge collection, he shortlisted one. "...He made a special attempt to buy a sari for Anushka," said Aamir's spokesperson.