It is of interest to examine how consumers perceive luxury brands with the different elements of authenticity, leading to brand image, for companies to create and build a brand that is conducive to influence purchase intention. Through a proposed conceptual research model, brand authenticity and brand image as the predictor variables, with brand preference as the outcome variable, the study investigates the causal relationship of these constructs, where eight (8) determinants of brand authenticity are assessed. Findings of the research support all nine proposed hypotheses, as a result, indicated that brand authenticity and brand image influence consumers’ brand preference. The same model development for the current study can be applied in other geographical zones and in different contexts to prove its generalisability. This study assists fashion marketing practitioners and brand managers to remain sustainable and better identify the factors that influence brand authenticity and brand image on brand preference of luxury sneakers among young adults in South Africa. The rapid globalization and increase in competition has caused a shift in the luxury industry so marketers need to focus on the authenticity of a brand to influence consumers’ brand preference. Theoretically, this study adds to the limited academic literature on the theory of reasoned action and the brand equity theory, with regard to branding.