The weight of a carcass after organs, excess fat, and inedible parts such as the head and tail have been removed during butchery.
Mid 19th century; earliest use found in Boston Post. From dress + weight, after dressed weight.
dress weight/ˈdrɛs weɪt/
1A small lead weight designed to be placed in the hem of a dress or skirt to make it hang properly.
2Cloth of a suitable weight for making into dresses; a piece of such cloth.
Late 19th century; earliest use found in Scientific American. From dress + weight.