This investigates how such apps can influence teenagers to make environmentally conscious choices in the fast fashion industry. Using human behavioral theories, the research examines whether strategies like the Theory of Planned Behavior can impact young adults (18-25) positively. The two-stage data collection, utilizing an app, aims to inform governments, organizations, and individuals about promoting sustainable consumer behavior among teens. The app-based survey explores clothing purchases, influencing factors, and environmental considerations using Likert scales. Statistical analyses contribute to the goal of raising awareness and empowering teens to make informed, eco-friendly choices for a more sustainable future.