A weathered brown coat, covered in metal plates which are attached with belts- some repurposed waist belts, some cut into the coat itself.
Depending on the variant of the outfit, the armored coat provides between 39 and 93 Damage, and between 69 and 150 Energy Resistance. Regardless of variant, it provides 10 Radiation Resistance. The MK V variant has both the highest base Damage Resistance and highest base Energy Resistance of any outfit in the game.
The level of the coat (MK I-V) that the NPCs carry is dependent on your level.
If you are interested in obtaining one of these coats it's highly recommended you get one during The Battle of Bunker Hill as this is the only surefire way to get one related to your level no matter which faction you wish to finish the main story with.
You can get away with being a lower level during The Battle of Bunker Hill due to some NPCs being a significantly higher level than you, resulting in the possibility to get a higher level coat.
Glory's coat will be Mk III if killed during a mission regardless of what level you are. Outside of a mission, the coat will be Mk I. However, if the coat is pickpocketed and Glory does not have any other clothes, it will respawn as Mk III.