Armored Vault 21 jumpsuit

The Armored Vault 21 Jumpsuit is a piece of armor unused

Gameplay

 * The Courier wears it during the end game cinematic and is seen in the Fallout: New Vegas E3 trailer.
 * Although it is cut from New Vegas and doesn't appear normally, it can still be equipped via console commands.
 * In the Fallout: New Vegas game manual, under the section about stealth, the Courier is ducking behind a car wearing the armored Vault 21 jumpsuit.
 * In the Fallout: New Vegas Official Game Guide, parts of this armor are depicted as used in Caesar's Legion armor.

Behind the scenes
The Courier is seen wearing it in the Lonesome Road trailer but was confirmed before the add-on was released not to make an appearance.