(Also as two words.) A wig fashionable in the 18th century, the back-hair of which was enclosed in an ornamental bag.
1717. Mrs. Centlivre, Bold Stroke, III. i. Now must Bag Wig and Busness come in Play; A Thirty-Thousand-Pound Girl leads the Way.
1766. Anstey, Bath Guide, x. 60. Bag-wig, and lacd Ruffles, and black Solitaire.
1850. W. Irving, Goldsm., xxv. 252. Walking the Strand in grand array with bag-wig and sword.
Hence Bag-wigged, a., wearing a bag-wig.
1775. Sheridan, St. Patr. Day, II. iv. (1883), 236. Pig-tailed lawyers and bag-wigged attorneys.