Revelation 19:8

Fine linen. The symbol of justification, or the good works and merit of her holy members; the most pleasing attire in which she can present herself to the Lamb. Her robe is glittering and white, because she has been purified as silver in a furnace, and washed white in the waters of tribulation and persecution. (Pastorini) --- The fine linen, or byssus, here mentioned, is, according to Calmet, a kind of silk produced by a shell-fish, called pinna; though the same learned commentator allows that the Greek authors use this word for fine linen.