mid-14c., tatrid, "clad in slashed garments," from tatter (n.) or its Scandinavian source.
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tatter n.
c. 1400, tatrys (plural) "slashed garments," from a Scandinavian source such as Old Norse töturr "rags, tatters, tattered garment," cognate with Old English tættec, tætteca "rag, tatter." Related: Tatters.