Libby McClean, an eager teenager, embarks on her first day at Canadian Cotton Clothiers, filled with anticipation. Surrounded by trendy clothing and an energetic environment, she encounters a unique group of coworkers, including the store manager, Craig, and his discontented team members, including Shruti, Hunter, Jemma, and Lord. Just when Libby starts to feel at home in the store, Harold Landsgrove, the founder of the company, drops by to inspire the staff for the much-anticipated launch of Super Shapers—innovative designer jeans that promise to adapt to any figure.
As the air buzzes with anticipation, Jemma succumbs to temptation and snags a pair of the coveted jeans from the storeroom, but soon finds herself suffocated by their constrictive hold. In response, Craig sends Hunter on a quest to find the missing Jemma, but she too falls victim to the jeans, meeting a tragic end when a coat hook impales her. Now faced with this grim turn of events, Libby is tasked to track down Jemma and uncover the truth behind Hunter's accident. Upon discovering Jemma’s mangled remains, Libby informs Craig, who shockingly prioritizes maintaining a facade of normalcy over calling for help.
As events escalate, Lord stumbles into the jeans, which grotesquely sever his limbs before transforming into a gruesome mouth that devours him. Disturbed by the horrifying sequence of events, Libby urges Craig to alert authorities, but he dismisses her pleas, insisting they must keep Jemma and Lord's fates secret until the product launch. Just when all hope seems lost, fashion blogger Peyton Jewels arrives, bringing her recording crew for an exclusive look at the jeans. However, their excitement quickly turns to dread when the jeans tighten around Peyton mid-filming, killing her and spiraling into a deadly spree that wipes out everyone in the store except Shruti.
Craig finally faces the grim reality when he witnesses the jeans gorging on spilled blood. Desperate to warn PR expert Barb Lubotski about the murderous denim, he inadvertently places her in the line of fire after she insults him. Later, Libby regains consciousness after being knocked out and uncovers Peyton's forgotten camera, revealing shocking footage of the carnage. She shares this with Shruti, who learns that they were spared due to her Bollywood-style singing at the time of the attacks. United, they confront Craig with proof of the killer jeans, yet he downplays their lethal nature.
As the jeans take on a more human form, Libby experiences a bizarre connection to India. With Shruti’s assistance, they attempt to communicate with the jeans in Hindi. In a chilling moment, the jeans write blood messages indicating they harbor the spirit of Keerat, a 13-year-old child laborer who was murdered in an Indian cotton field linked to Canadian Cotton Clothier's seemingly ethical product line. This revelation triggers a tumultuous confrontation, forcing Craig to face the truth about the company's exploitative practices.
Desperate to salvage his reputation, Craig proposes a deal to Libby and Shruti: he will end the cycle of child labor in exchange for silence about Keerat’s tragic story. Just as the negotiations seem promising, Craig disrupts the moment with a fire extinguisher, scattering the possessed jeans into chaos. In the ensuing turmoil, more haunted jeans emerge, preying on the deceased.
In a rage-fueled frenzy, Craig attacks Shruti, intent on reclaiming the camera containing incriminating evidence of his illicit activities, only to discover that the memory card has gone missing. As he chokes Libby in his frantic search, he is besieged by a horde of vengeful jeans that consume him entirely.
Despite sustaining severe injuries, Libby finds the strength to rise just as the store's lockdown is about to release. In a desperate attempt to secure the doors, she is overwhelmed by panicked customers rushing inside. As the doors swing open and the jeans commence another brutal attack, Libby clings to the memory card, a grim reminder of the horrifying ordeal that has transpired.
