Vault 87 jumpsuit

is Vault Jumpsuit from Fallout 3. The suits were worn by the ill-fated subjects of Vault 87's Evolutionary Experimentation Program. Although the Vault 87 Jumpsuit was put into the game's files, the game itself offers no opportunity for the player to obtain one, and the only one seen throughout the game is worn by Fawkes, ripped to shreds by his enormous super mutant body.

To get the jumpsuit, the player must put "player.additem 340ED 1" without quotes into the console.