Where does “costume” come from?
costume (Romanian) comes from Romanian costum, from French costume, from Italian costume, from Latin cōnsuētūdō, from Latin cōnsuēscō, from Latin suēscō, from Proto-Indo-European swe-dʰh₁-sk-, from Proto-Indo-European dʰeh₁- — to do, put, place.
costume (Romanian): plural of costum
Ancestry of “costume”, step by step