v. Simple past tense and past participle of frock.
the GNU version of the Collaborative International Dictionary of English
adj. Clothed in a frock.
Word Usage
"The message announced tersely that Lieutenant Commander Robert A. Toland, III, USNR, had been "frocked" as a Commander, USNR, which gave him the right to wear the three gold stripes of a commander, but not to collect a commander's pay just yet."