Tomato Red, Kelly Green and Raspberry pink would look great if you wanted the outfit to pop. If this is for a conservative workplace setting then I would wear black.
i would wear brown (though i guess lots of people don't like the combo of gray & brown). something about navy and black irks me. if you want pop, then red, also yellow is a good color too. i wore a similar outfit, navy top, grey skirt, and paired it with yellow peep toes.
Tomato Red, Kelly Green and Raspberry pink would look great if you wanted the outfit to pop. If this is for a conservative workplace setting then I would wear black.