In Ancient Roman regalia, a laticlave, or clavus, was a broad stripe or band of purple on the fore part of the tunic, worn by senators as an emblem of office, from which the difference of the tunica angusticlavia, and laticlavia.
词源
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laticlave:
From Late Latin lāticlāvium, lāticlāvus, from lātus ?(“broad”) + clāvus ?(“purple stripe”).