fustaneum.

An ellipsis of (pannus) fustāneus or (tela) fustānea, of uncertain origin; often taken to be from the name of the city الفُسْطَاط (al-fusṭāṭ) via an Arabic فُسْتَان (fustān, “dress”). However, the late attestation and formal variation of the Arabic word means that it is likely ultimately from Medieval Latin or one of its Romance descendants. Alternatively, some have derived this word from fūstis (“stick”) + -āneus (in reference to plant textiles), possibly as a calque of Ancient Greek ξύλινα λίνα (xúlina lína, literally “wooden flax”); for the semantics, compare German Baumwolle.