Black clothes have many positives. They make you appear slimmer and more mysterious. Black is a natural color that can be mixed with almost every other. Wearing it will make you look better. For example try out a full black outfit from head to toe.
That is a good idea that can be deployed, when you can not choose what to wear. It is good to use a full black outfit no more than two times per week, otherways your style would become boring. You also should not wear black outfits if you go out in the summer, because the color black observes sunlight. That will raise your body temperature and make you sweat.