The story is set in the 70's in Kashmir and the look reference given to him by Abhishek Kapoor was that of Mr. Bachchan from Silsila and Kabhi Kabhi. He too is tall like Mr.Bachchan, so Abhishek thought that he'd be able to carry off the famous 70's look of his.
Akshay will be seen sporting bell bottoms, sweater vests etc.He also saw the film Silsila and Kabhi Kabhi before staring the schedule to get the look reference right. Interestingly, both Silsila and Kabhi Kabhi were shot in Kashmir itself back in the days.