Blazer: Helmut Lang Sonar Wool Crop Jacket (Black).
Top: J.Crew (Black/white).
Pants: Alice + Olivia Zip-front leather leggings (Black).
Shoes: Jean Michel Cazabat Wedge Booties (Black).
Rings: Aldo (Gold).
Bag: 3.1 Phillip Lim Pashli Satchel (Black).
The best tip to wearing an all black or almost all black outfit is to play with textures. Here I have leather, wool, suede, and silk. It definitely helps make the outfit much more interesting.