Instructions to install:
1. Download the file.
2. Edit Fallout4.ini (can be found in "X:\Users\"your windows username here"\Documents\My games\Fallout4") to contain sResourceDataDirsFinal=STRINGS\, TEXTURES\ instead of sResourceDataDirsFinal=STRINGS\ .
3. Unzip the texture folder to your Fallout 4 data folder location (\Steam\steamapps\common\Fallout 4\Data).
4. To use another color, just replace the texture in your Fallout 4 Data\Textures\Armor\KnightUnderArmor location with one from a color folder.
5. All done!