The production of denim harms the environment, and given the industry’s size, the negative impact is significant. Therefore, denim must be produced more sustainably. In order to bring about change in the industry, an increase in demand for eco-friendly jeans is necessary to incentivise investments in sustainable production methods. Here, low-cost clothing brands and retailers can play a crucial role. With their substantial share in the denim industry and their connection to consumers, they have the ability to grow demand through effective Sustainability Communication. Unfortunately, their efforts currently overwhelm and confuse consumers, consequently damaging consumers’ green buying intentions. Therefore, this thesis, in collaboration with House of Denim, a non-profit striving for a more sustainable denim industry, investigates how low-cost brands and retailers can adapt their Sustainability Communication to ultimately increase the popularity of sustainable jeans. To find a solution, this thesis examines the inter-organisational relations in the current system for SC, the brand's and retailers’ experience of the system and future notions by means of interviews and a literature study. The investigation of the current system uncovered the multifaceted complexity that causes the SC shortcomings of low-budget brands and retailers. The inter-organisational challenges that contribute to this complexity are the indefinite and incomplete means of authorities that fall short in offering the industry constructive guidance. In addition, internal challenges from brands and retailers contribute to the complexity as their commercial strategy is in conflict with sustainability efforts; they operate individually and end up discouraged. On top of that, the competitive nature of the fashion industry, driven by seasonality, and fast-changing trends on low price points makes it challenging for low-cost brands and retailers to prioritise sustainable efforts. Nevertheless, upcoming European legislation and showcasing eco-efforts to consumers are the predominant motivators for these businesses to invest in sustainable practices. To overcome the complexity, brands and retailers must collaborate to level the playing field for SC towards consumers. Therefore, the final design is a proposal for a Dutch Denim Coalition. It presents the vision in a storytelling poster, suggests a strategy to build the coalition and offers dialogue starters. The coalition unites brands and retailers and connects them with knowledge and experts. The goal is to encourage managers from brands and retailers to adopt the same principles for sustainable denim and collectively work on improving the current system for SC. This thesis highlights the fundamental issues that hinder the change of these low-cost clothing brands and retailers. It emphasises the significance of involving non-sustainable brands and retailers in sustainability discussions, as they represent a large part of the denim market and cannot be ignored. Hence, the design suggests a new direction for House of Denim which revives and enlarges the impact of their resources with a more inclusive view of the denim industry. Ultimately, it brings them one step closer to their vision; a Brighter Blue.