The fashion industry as a whole is ever-changing, so attempting to pin down one evergreen definition for categories like sustainable and ethical fashion is futile. For example, you may prioritize living wages and safe working conditions. But there is so much more that can be classified as "ethical." Others may value second-hand clothing more than ethically made garments. Perhaps vegan clothing is your top priority. It's difficult to define when not everyone has the same values. Because the movement is still learning and growing.