Sometimes I search for a 10th Commandment item for hours, but the second I spotted this simple black sheath, I knew it was the one. The simplicity of the cut makes it the perfect canvas for creating an outfit.
Also at Dorothy Perkins, I found this Billie and Blossom black dress with leather accents. This capped sleeve dress is also a good choice, and I like this midi-length tube dress a lot, but probably not for work. My favorite, however, is this $35 dress with a simple black-knot detail.
If you have more money to spend, I like this sleeveless sheath from Hugo Boss a lot.