Andean prehispanic textiles are renown for being complex masterpieces made with labor-intensive techniques and high-quality raw materials. Nevertheless, the vast majority of textiles, those used by the population at large, were plain, simple, and without any decoration. We study a sample composed of the most common textiles used by people living at Cerro de Oro in the Cañete Valley, Peru. Our analysis focuses on fiber selection, yarn thickness, and the presence of errors throughout the process of weaving. We discuss relevant aspects of the social process of textile production, such as the role played by plain-weave textiles in different contexts, their use in different types of garments, and the varied ways community members, with particular skill levels, participated in clothing the living and the dead at Cerro de Oro.