<![CDATA[In light of the ongoing climate crisis, the fashion industry remains a significant contributor to global carbon emissions. This research explores how Islamic ethical principles can inform sustainable business practices within Indonesia's modest fashion sector. The study employs a mixed-methods approach, integrating a systematic theological review with quantitative carbon footprint assessments. A purposive pilot sample of six Muslim fashion brands was selected and stratified by Instagram follower counts (Micro, SME, and Large). This sampling strategy was designed to provide a representative snapshot of operational scales, testing the framework's applicability across various business sizes rather than serving as a general industry census. Data collection was carried out via Instagram to assess market size and through Shopee to gather product-specific materials and sales information. Greenhouse gas emissions were calculated in accordance with the Greenhouse Gas Protocol (2004) and employing the UK Department for Environment, Food and Rural Affairs (DEFRA)’s standardized emission factors. The findings reveal considerable variation in emissions, ranging from 39.825 to 8,228.5 kg CO2e, indicating that sustainability outcomes are influenced more by production ethics and material choices than by business size. Crucially, the results reveal a "Carbon Information Gap," in which significant opacity in data for certain brands points to a lack of adherence to the Islamic principles of Amanah (trustworthiness) and Sidq (truthfulness). The research suggests that brands with the largest carbon footprints often exhibit "ecological shirk," prioritizing anthropocentric commercial growth over the divinely mandated Mizan (balance). To bridge the divide between these commercial practices and Islamic environmental ethics, the study introduces the HIFZH Model, a faith-based framework for sustainability, along with a 20-point checklist for practical self-assessment by businesses. This framework reframes sustainability from a mere regulatory obligation into a moral imperative, encouraging low-carbon, ethically responsible entrepreneurship that reestablishes the business owner's role as a Khalifah (steward) of the Earth. Keywords: Fashion industry, Sustainability, Islamic ethics, Islamic economics, Climate crisis JEL: A11, A13 ]]>
