noun. A wig with the back hair encased in a small silk sack, worn in the 18th century.

noun. A wig the back hair of which was inclosed in a bag. See bag, 3.

noun. A wig, in use in the 18th century, with the hair at the back of the head in a bag.

"Not a whit less reticent and wooden was Mr Flintwinch outwardly, than in the usual course of things: the only perceptible difference in him being that the knot of cravat which was generally under his ear, had worked round to the back of his head: where it formed an ornamental appendage not unlike a bagwig, and gave him something of a courtly appearance."