Purpose: Although interest in sustainability within the fashion apparel industry has increased over the last decade, ethical fashion remains a minority trend due to low consumer awareness and consumption behaviour. The aim of the paper is to explore empirically the relationships between general consumer support for ethical fashion, buying intention and willingness to pay, focussing on the effect that consumer concern and knowledge and beliefs have on these variables. Design/methodology/approach: Data were collected from 450 general consumers in Spain, who are not specifically dedicated buyers of fashion apparel goods. Responses were collected with a structured questionnaire that included multi-item scales to measure all the variables of the causal model. After corroborating the reliability and validity of the measurement scales with confirmatory factor analysis (CFA), 11 research hypotheses were explored using a structural equation modelling (SEM) approach. Findings: The findings demonstrate that whilst beliefs are not predictors of consumer support for either social or environmental issues, concern and knowledge are antecedents of consumer social and environmental support, which determine general support for ethical fashion, intention to buy and willingness to pay. Consumer social support has a slightly higher impact on consumer support for ethical fashion, intention to buy and willingness to pay than environmental support. Originality/value: The purpose of the paper is to contribute to the literature by empirically comparing general consumer perceptions, attitudes and behaviours towards the social and environmental dimensions of ethical fashion. In doing so, the authors aim at shedding light on the complex concept of ethical fashion and how general consumers understand it. The findings suggest that promoting educational marketing especially focussed on environmental issues is necessary to raise consumer awareness, knowledge and ethical consumption.