A knee-length pleated tartan skirt worn by men as part of the traditional dress in the Highlands of northern Scotland WordNet 3.0 & Open English WordNet

A kilt is a garment resembling a wrap-around knee-length skirt, made of twill-woven worsted wool with heavy pleats at the sides and back and traditionally a tartan pattern. Wikipedia

Knee-length garment of Celtic and Scottish origin Wikidata

A traditional Scottish garment, usually worn by men, having roughly the same morphology as a wrap-around skirt, with overlapping front aprons and pleated around the sides and back, and usually made of twill-woven worsted wool with a tartan pattern. Wiktionary

Traditional Scottish garment. Wiktionary (translation)