Same reason they're called braids - same thing, different origin. Braid is Germanic, plait is from French, they both seem to have turned up in the Middle English period. Braid may have started out meaning hair woven into strands with a ribbon or similar woven through.
(Allow me a chance to open my NSOEDII and I'll take it!)
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Date: 2012-09-13 05:40 pm (UTC)(Allow me a chance to open my NSOEDII and I'll take it!)