"Costume designing has been challenging for Farhan and I wish and pray it's a big hit. We were very conscious about that... We had gone and met Milkha Singh many times to get the feedback," Dolly told PTI.
"Film is a creative medium and so we definitely took a little liberty for Farhan's look but no long leaps. It is a long film with a journey of a young boy of 10 to a man of 30 years," she said.
The veteran actor played mother to Ayushmann Khurrana in 'Vicky Donor' and won the national honour.
Earlier, she bagged the National Award in 1996 for costume designing in Shekhar Kapur's 'Bandit Queen' and the Filmfare Award for Best Costume for Vishal Bharadwaj's 2007 film 'Omkara'.
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Now, she will be seen playing mother to Tusshar Kapoor in Shashank Shah's next.
"I am playing Tusshar Kapoor's mother. I am playing a woman caught in different circumstances and how she reacts to it," she said.
Her another acting project is 'Ek Sarkari Jhoota' directed by Rahat Kazmi where she has teamed with Raghuvir Yadav.