Everyone know the saying of "work hard, play harder", right? Well, I do believe that you do deserve to have fun and let loose once in a while. Working hard for your future is great and all. But if you not take the time to actually enjoy what you've been working hard for then you will end up losing yourself. That used to be my life when I was living in New York City. I was busy working and not living. Took me awhile to realize that your happiness is worth more than you think.
Make sure all of your black pieces are the same tone and shade of black. Let's get one thing straight. Just because the color is black, it doesn't necessary mean is going to be the same shade or tone. So double check.
Play with the fabric and texture of the pieces. When wearing one color head to toe, you have to play up the fabric to create some contrast in the look. That is when the smallest detail matters.
Footwear is very important here. You don't want match the color of the footwear completely to your outfit. Play it up by wearing a pair shoe with a white sole. For example, the shoes that I am wearing in this post is all black with white sole. Or a pair of white shoes would work fine too.