Ἀτραβατικάς

In festivals and triumphs and when ambassadors are present [the Romans] used to put on many-colored chitons and cloaks, with gold and purple and otherwise costly, and ones scarlet in color in common assemblies, which they called Atrabatic [ones] from their color; for they call black atron;¹ or because they are accustomed to use these with trabeas; trabeas [trabaiai] is the name for costly cloaks.²