Although extensive research has been carried out on intergenerational effects related to consumption between adolescent daughters and their mothers, few studies have focused on consumption interaction between adult daughters and their mothers. Especially as adult daughters and mothers get older, the mother-daughter relationship evolves into one characterized by increased sharing. It is observed that the role of adult daughters in their mothers' choices is increasing. This study aims to determine whether social comparison motivation affects the relationship between the adult daughter-mother connectedness and their hedonic co-shopping, co-consumption of fashion products, and inclination to change mothers' clothing styles. In other words, the current study examines consumption interactions between adult daughters and their mothers from the perspective of social comparison theory, based on the opinions of adult daughters. Data for this study were collected employing survey methodology with 380 females aged 18-35 who shop with their mothers. The respondents were determined through the judgmental sampling technique. The structural equation modeling (SEM) approach was used to identify the causal relationships between variables. According to adult daughters, their connectedness with their mothers positively affects their mothers' social comparison motivation. Mothers' social comparison motivation positively and significantly influences hedonic co-shopping. It also positively affects the role of adult daughters in changing their mothers' clothing styles and the co-consumption of fashion products. However, the effect of social comparison motivation on these two variables is lower than the effect on hedonic co-shopping. The findings of this study suggest some practical clues for marketing communication messages that brands in the fashion sector will develop.