Plot summary

Mauji (Varun Dhawan), an incompetently illiterate young man, has inconvenient work and individual life. His boss treats him like a dog, his father never stops cursing him, and he has not even touched his wife Mamta's (Anushka Sharma) hand despite being married for years due to lack of space at home. But he always carries himself with a big smile despite facing odds. "Sab Badiya Hai"Jugnu (Mauji's brother) (Sawan Tank), Jugnu's wife (Manukriti Pahwa) and their son live separately but use Mamta as a babysitter for their kid. Mauji works at a shop that sells sewing machines and his boss & his son literally treat him like a dog. Mauji takes it in good humor, but his family is deeply offended when the boss makes him do dog impersonations at his son's wedding. Mauji is happy, but Mamta is disgusted at what she saw.Although he appears to be a useless man, Mauji is a champion in the art of tailoring, which his father (Raghuvir Yadav) believes to be a disadvantageous mode of occupation. However, being fed-up of licking his boss' boots and getting motivation from Mamta, Mauji decides to self-employ himself and set off with his sewing machine. Although his parents are strictly against his decision, Mauji receives constant support from his wife Mamta. Mauji sets up his sewing machine at a open spot in the market, which is owned by the municipality.Mamta and Mauji also advertise their services in the nearby market. But then Mauji's mom has a heart attack, and the pressure grows on him to get a job as the medical care eats away at his dad's meager PF savings. Mauji makes a maxi for her mother's stay at the hospital. It is such a hit that everyone gives a Rs 500 advance for a new maxi made by Mauji. He gets almost Rs 5000. He and Mamta get the cloth for the order, but the neighbor who had given them the sewing machine asks for a 40% cut, which Mauji refuses after a scuffle.Mauji learns of a Govt scheme for a free sewing machine if one proves that they are a tailor. Mauji and Mamta travel 40 Kms to the test, but Mauji injures his foot & is at a pharmacy and Mamta has to go inside alone for the test when her number comes. After much hassle Mauji convinces an official to go inside the test hall to take his seat. FInally, they get their sewing machine.Mauji's mom is discharged from hospital, but the bill is Rs 1.5 Lacs, which is more than what the family can afford. They call in Jugnu's brother-in-law Guddu (Namit Das), who knows the hospital administration & gets them a undercover deal for Rs 70,000. Guddu also arranges for Mauji to become a contract tailor for the hospital's registrar (they guy who cut the bill to Rs 70,000 but gave no receipt). But, then instead of offering them a contract, the factory offers employment at Rs 8,000 per month to Mauji and Mamta. Mamta doesn't trust Guddu but goes with Mauji's instincts to take the job. The owner of the factory completely changes the design of the maxi and sells it the hospital for Rs 500. The next time Mauji's mom visits the hospital, they charge him Rs 2000 for the same maxi. Mauji is livid at this and takes up a fight with Guddu at the factory. He is fired & they don't even return Mauji's sewing machine.Mamta suggests that to get justice, they should enter the same fashion show that the factory owner was talking about attending. They work day and night and borrow resources to come up with designs for the show. They name the company Sui Dhaaga. Mauji & Mamta mobilize the help of the entire neighborhood to meet the requirements of the fashion show. Even Mauji's dad decides to contribute. On the day of the show, Mauji's handmade designs and daily workers go up against big labels and foreign models. After a bit of drama, they end up being declared as winners. Sui Dhaaga becomes a global brand. Mauji & Mamta get to tell their story on many high-profile forums and open up a tailoring school for budding entrepreneurs.