A simple retexture of synth armor to make it black.
Make sure you’ve edited your ini file to include the \textures directory and then simply extract to Fallout4\Data\textures\armor (Create this folder if it doesn’t already exist)
Shown with BoS officer uniform in the screenshot. Also shown is mm137’s great black and white Pipboy retexture.
Added image to show just the armor pieces with nothing underneath.