This study investigated the conceptual constructs of ethical consumption beliefs and their impacts on the consumer attitudes toward eco-friendly faux leather apparel goods. The mediating roles of perceived consumer effectiveness and apparel environmental knowledge were examined in this research. A survey was conducted on female consumers between the ages of 20 and 50; subsequently, 300 responses were analyzed. The results of this study were follows: 1) The results of factor analysis and the reliability test on ethical consumption beliefs clearly showed factorial structures that include Social Responsibility, Eco-friendly Consumption, Animal Welfare, and Individual Enhancement. 2) The results of the mean scores of ethical consumption beliefs showed that respondents tended to consider Social Responsibility more important than the other three factors. Ethical consumption beliefs showed a significantly positive influence on consumer attitudes toward eco-friendly faux leather apparel products; in addition, Social Responsibility had the highest effect on product attitudes among the four factors of ethical consumption beliefs. 3) The perceived consumer effectiveness and environmental knowledge of apparel had important medicating roles in the relation-ship between ethical consumption beliefs and attitudes towards eco-friendly faux leather apparel products. This study highlighted a potential marketability of eco-friendly faux leather apparel products and that ethical consumption beliefs, perceived consumer effectiveness, and apparel environmental knowledge should be promoted among consumers to increase favorable attitudes towards these products.