My mid-twenties self says its a rockin' casual Friday look.
My teenage self says black goes with black, brown goes with brown, and blue goes with blue.
My mid-twenties self says who cares as long as it looks good? Mix it up! You wanna wear black and navy? Sure! Pair it with sparkly flats? Go ahead! As long as you rock it (no matter what looks you get from the khakis-and-collars-only peeps at work :P)
Cheers to the weekend!
J&H
p.s. first mobile post!