This chapter examines the dramatic social transformations that characterized the Postclassic period (AD 900–1521) in the Aztatlán region of far west Mexico. In particular, the author proposes that these changes relate to the onset of a new and non-local political-religious solar and rain complex focused upon the Mesoamerican solar deity Xochipilli and the Flower World. This complex was centered in the Pacific-coastal Aztatlán heartland where cotton spinning, weaving, and finished textiles played a central economic and ideological role in newly burgeoning macroregional economic networks. The chapter critically examines evidence of diverse weaving technologies and related artifacts, as well as complementary comparative ethnoarchaeological data from adjoining regions. It concludes that with the arrival of the Flower World complex in Postclassic Aztatlán, the act of spinning and weaving—whether for household consumption, tribute, or gift and market exchange—was not simply a daily domestic task of women. Instead, these crucial activities positioned women as active participants in the symbolic and literal creation of life itself by enacting cosmological order, ensuring the creation and daily transit of the sun across the sky, and facilitating the arrival of the ancestral clouds and rain to Aztatlán communities.