I know the D of S has worn this and (may just be me) I quite like it as a look. But then I'm utterly wedded to both colours and love my dark neutrals!
Just wondering whether a black pencil skirt with a dark navy silky blouse would work. Maybe contrasting (bright?) shoes with it. Or just plan black shoes, really just wondering what people think about navy and black together and if it's ineffably chic or a total no-no!