BOS hood (Fallout 4)

The BOS hood is a piece of headwear $$

Gameplay
Counting as underarmor, the matching hood for the BOS Uniform can be worn under power armor.

Locations
Worn by Paladin Danse and can be traded once he's been recruited as a companion.

Behind the scenes

 * In the opening cinematic, a soldier in power armor is seen wearing a similar hood.
 * The item is mentioned in the Fallout: The Roleplaying Game Rulebook.