(in ancient Rome) a white toga with a broad purple border, worn by priests and magistrates as an official costume, and by certain other Romans as ceremonial dress.
a similar garment worn by a boy until he assumed the toga virilis, or by a girl until she married.
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How to use praetexta in a sentence
Each wore a wreath of corn, a white fillet and the praetexta.
They also wore the toga praetexta, which, though associated by us with secular magistrates, had undoubtedly a religious origin.The Religious Experience of the Roman People | W. Warde Fowler
Octavia, a late praetexta ascribed to Seneca, was certainly not written by him.