I immediately thought of wearing it with straight/skinny jeans (a noticeably lighter/faded jean as compared to the jacket) and a white mens-style button down untucked. Depending on the occasion you could style it up with heels and a nice bracelet or earrings, or down with flats and minimal jewelery.
Based off something Amneris said, I also think it would be great as a "transition to spring" type of outfit. With a great floral or Spring/summer dress, and some boots.
Navy and black is a great combination these days, too, if the navy's not TOO close to black itself. I'd do skinny black pants with heels or boots and a flowy blouse in a print or any lighter color.
"I don't know! I don't know why I did it, I don't know why I enjoyed it, and I don't know why I'll do it again!" -BART SIMPSON