Now that I've seen what it looks like on my screen and in game and all that, I kind of want to go back to the original black outfit. I initially just went with the 'darker colors' choice since it was dark red and black. However when installing it they give you the option to choose different colors for your assassin outfit. It changes their armour, adds some weapons, and makes the notices in the journals a bit different.
This mod changes a few things regarding the Dark Brotherhood.