1) A gown, cloak or other item of clothing, some times a type of cloth.
1726 threw her mantua skirt over the child’s feet, Huddersfield
1729 they had in their Sacks ... a Childs Coat, a Mans Coat a Woman’s mantua, Stainland
1739 a mantua maker, Southowram. In one much earlier reference the meaning is not transparent: 1508 De ijd pro j piece del bankcover. De xd pro j mantua. De xijd pro j magna laterna, York.