heavily dressed due to cold weather; dressed in fleeces (see Molina)
Alonso de Molina:
motatapachquenti. arropado, o enzamarrado por mucho frio. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 060r. col. 1. Thanks to Joe Campbell for providing the transcription.