Clothing language, a concept rooted in semiotics and fashion psychology, refers to the non-verbal communication conveyed through attire, reflecting personal identity, social status, and cultural affiliation. In Nigerian tertiary institutions, the clothing choices of female undergraduates have become a topic of considerable interest, given their implications for gender norms, societal expectations, and institutional policies. This investigation explores the causal factors influencing the "clothing language," of female undergraduates in Nigerian tertiary institutions, where cultural, religious, and social dynamics are deeply intertwined with daily life. A mixed-methods approach was utilized using both quantitative and qualitative research methods. A cross-sectional survey was conducted to gather data from female undergraduates across various Nigerian tertiary institutions. The study revealed that cultural background, religious beliefs, socioeconomic status, peer influence, and media and popular culture significantly shape students’ clothing choices. Each of these factors was analyzed in relation to the research questions and hypotheses, providing both quantitative and qualitative insights into the patterns, motivations, and symbolic meanings associated with clothing among female undergraduates. Clothing choices made gives an insight into what shapes the social interactions of these students thereby reflecting the role such choices play in understanding students’ culture. These findings will inform university policies, enhance campus inclusivity, and enrich academic literature on clothing and fashion in Nigerian tertiary institutions.