Where does “cotte” come from?

cotte (Middle French) comes from Old French cote, from Frankish kotta, from Proto-Germanic kuttô, from Proto-Indo-European gudnó-.

Ancestry of “cotte”, step by step

Step	Language	Word	Meaning
1	Old French	cote	Alternative form of cotte; coat, robe, tunic,...
2	Frankish	kotta	coat
3	Proto-Germanic	kuttô	cowl, woolen cloth, coat
4	Proto-Indo-European	gudnó-	—

cotte — Etymology, Origin & Word History | Etymology Explorer