imaxtli.

a paper loincloth worn by the image in the round of Huitzilopochtli; it was made of white (not yellow) amatl, and it measured a finger's thickness, a fathom (cenmatl) wide, and twenty fathoms (cempoalmatl) long

Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 2 -- The Ceremonies, No. 14, Part III, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1951), 69.