1Any of various garments covering the upper body and reaching below the waist; (in later use) specifically an outer coat reaching to the calves or ankles.
2historical, rare Frequently in plural. A gown worn by young children (including boys before breeching), occasionally specifically (in plural) long garments worn by babies. Frequently also (and in earliest use): the clothing traditionally worn by a fool.
3A breed of animal (especially of dog) with a long coat; an animal of such a breed.
Mid 16th century; earliest use found in Thomas Elyot (c1490–1546), humanist and diplomat. From long + coat.