Blast Off pajamas
Blast Off pajamas are pre-War children's clothing found in Fallout 3. The matching Blast Off helmet can be found in the game files but is not actually used in the game.
It offers no bonuses to the player and has no real use. It is a child item and the Pip-Boy icon is that of a Vault 101 jumpsuit.
The world model and Pip-Boy icons are that of the Vault 101 jumpsuit.