Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
The common girdle was made of leather (2 Ki. 1:8; Mt. 3:4); a finer sort of linen (Jer. 13:1; Ezek. 16:10; Dan. 10:5). Girdles of sackcloth were worn in token of sorrow (Isa. 3:24, 22:12). They were variously fastened to the wearer (Mk. 1:6; Jer. 13:1; Ezek. 16:10).
The girdle was a symbol of strength and power (Job 12:18, 21, 30:11; Isa. 22:21, 45:5). "Righteousness and faithfulness" are the girdle of the Messiah (Isa. 11:5).
Girdles were used as purses or pockets (Mt. 10:9. A. V., "purses;" R.V., marg., "girdles." Also Mk. 6:8).