This study analyzes the influence of apparel/clothing brand social media marketing activities (SMMAs) on brand equity and customer response in Pakistan. First, the current SMMAs are examined; then, we propose new attributes, i.e., fundamental social media marketing activities (FSMMAs) and sophisticated social media marketing activities (SSMMAs) such as interactions, sharing, and trendiness. Second, the influence of innovative components, i.e., FSMMAs and SSMMAs, are analyzed regarding brand equity and customer response toward apparel brands. A survey was conducted with a total of 406 Pakistani customers who used apparel brands, and the collected data were analyzed through confirmatory factor analysis (CFA) and Hayes PROCESS macro in SPSS. From the empirical results, we concluded that apparel brand equity (i.e., brand awareness, brand image) significantly mediates the relationship between FSMMAs and customer response (price premium willingness, customer loyalty). Moreover, it is also determined that SSMMAs moderate the indirect association of FSMMAs and customer response via brand equity.