Where does “palla” come from?

palla (Old Portuguese) comes from Latin palea, from Proto-Indo-European pel- — to cover, to wrap; skin, hide, cloth; to fold.

Ancestry of “palla”, step by step

Step	Language	Word	Meaning
1	Latin	palea	chaff; The wattles or gills of a cock; dross
2	Proto-Indo-European	pel-	to cover, to wrap; skin, hide, cloth; to fold