No, coffee will not restore black clothes. Coffee can actually stain clothing, so it is best to avoid using it on dark fabrics. Even if you do try washing a garment with coffee, the results are likely to be unsatisfactory because coffee does not contain any bleaching or brightening agents. If you have stained a piece of clothing with coffee then use detergent and some warm water to wash the garment thoroughly before drying in order to reduce the appearance of the stain.