From Longman Dictionary of Contemporary Englishdressed to killdressed to killinformalDC wearing very attractive clothes so that everyone notices and admires you → dressed
Examples from the Corpus
dressed to kill• In her black velvet cocktail dress, Elaine Russell was dressed to kill.• Erica, who had been dressed to kill when he got to the flat, had agreed.• He is dressed to kill with no place to go. 