With Jana Nayagan set to release on July 23, garment manufacturers in Tiruppur are witnessing a massive surge in demand for custom-printed T-shirts inspired by the film. More than 70 units are working at full capacity to fulfil bulk orders from fan clubs, theatre owners, distributors and retailers. Manufacturers say the excitement is driven by the belief that Jana Nayagan could be Thalapathy Vijay's final film, making the merchandise a symbol of fans' emotional connection with the actor ahead of the release.