Just download and install as normal.  Does not affect vanilla vault suits.
Adds 2 novel black retextured vaultsuits.  Ballistic weave compatible. 
1) "Treated Army Vault Suit" (+1 STR/AGI) from Arturo in Diamond City.  
2) " Protective General Army Vault Suit" (+2 CHR since General, +1 STR/AGI, +20 DR) 
found in toolcase near dead General in Castle.