What word does your mother always say?
"plaited tartan skirt," c.1730, from Middle English verb kilten "to tuck up" (mid-14c.), from a Scandinavian source (cf. Danish kilte op "to tuck up;" Old Norse kilting "shirt," kjalta "fold made by gathering up to the knees").
"to tuck up," mid-14c., of Scandinavian origin; cf. Danish kilte, Swedish kilta "to tuck up;" see kilt (n.). Related: Kilted; kilting.