The increasing awareness about environmental issues on the part of consumers has impacted the expectations they have from new businesses, especially in the fashion industry. In this research, titled "Green Values, Credible Brands: Studying the Impact of Sustainability on Consumer Trust in Sustainable Fashion Startups," the relationship between sustainable practices, the creation of credible brands, and the impact of these brands on consumer trust has been investigated. The study has analyzed the influence of eco-friendly materials, ethical sourcing, transparency, and responsibility on consumer perceptions. For the purpose of data collection, a structured survey method was employed, and consumers who had experience of buying sustainable fashion products participated in the study. It is evident from the findings that sustainability efforts have a major impact on trust, purchase intention, and even brand loyalty. Transparency and authenticity have turned out to be essential variables in the connection between green practices and consumer trust formation. The research offers significant implications for startup entrepreneurs and marketers interested in developing a sustainable business practice.