2) Add a color or print in your coat/jacket/shoes - adding a color of some sort or print, leopard being my favorite, breaks up the all black factor! And if you are bold go for that bright coat or jacket. It definitely brightens up any outfit.
3) Textures - Think silk, sequins, velvet, wool. Fabrics with texture in black look luxurious so when you buy black go for quality.
4) Find a shape or silhouette fitted somewhere. Black, shapeless garments are the worse and can make you look bigger than thinner. A halter, a tank, a fitted waist, a peplum, all these things help give you shape and break up the black.
5) Jewelry, bag, shoe - this is my foolproof combination. One piece of jewelry (gold dangle earrings or a pretty necklace), a great bag and a fabulous shoe will stylishly get you through any outfit. If you have extra money to spend, go for the bag or shoe that can be worn time and time again and save on the outfit.
Hope you find my tips useful! Wear black but add a touch of yourself.