Old Fr. 'cotte' plus 'hardie'¹  Eng. 'coat-hardy'.  End of 14th century.  YSG, 259: "... Marchawc urdawl yn dyuot a chotardi o scarllat coch ymdanaw."  ib. 295

Troednodyn 1: The [h-] of the French form would not have been lost by the time of borrowing. It may have been lost in Welsh under the influence of other French forms in which h was written but not pronounced.