On March 27, 2026, the English Department, Faculty of Education, Suan Sunandha Rajabhat University, organized an activity for the English Classroom Management (EEI1304) course, Semester 2/2025, for first-year English students. The activity, an English camp themed "Fight Against Fast Fashion," was designed as part of the learning achievement assessment. Students designed learning activities based on the Content and Language Integrated Learning (CLIL) concept, combining English language learning with awareness of Sustainable Development Goals (SDGs) through 12 different activity stations. The "Fight Against Fast Fashion" activity addressed SDG 4, and the application of CLIL reflected innovative and high-quality teaching methods, elevating English learning beyond rote memorization to include understanding and practical application, such as engaging students in discussions about the impact of fast fashion on the environment and encouraging them to develop sustainable practices.