There are indications that future archaeological investigations of the Late Postclassic horizon of the central and eastern Gulf Coast will reveal the existence of several regional artistic subtraditions of the prevailing Mixteca Puebla horizon style. This would discourage the current pan "Mixtec" approach to the interpretation of Postclassic Mesoamerican culture. A consequence of this presently confusing practice is the provenience debate concerning the religious Borgia Group codices. An abstract methos of costume analysis indicates that these pictorial manuscripts did not originate in the Mixteca because they do not display Mixtec ritual clothing patterns. Data from the costume analysis, together with internal clues from the codices and archaeological and ethnohistorical evidence, demonstrate that the Borgia Group codices had diverse origins. The general Peubla Tlaxcala region is suggested as the probable homeland for codices Borgia, Cospi and Vaticanus B. The stylistic twins, Fejérváry Mayer and Laud, are assigned to the eastern Gulf Coast.