Vault 77 jumpsuit

The Vault 77 Jumpsuit was the standard Vault-Tec piece of clothing originally worn by the Puppet Man, the only inhabitant of Vault 77.

In Fallout 3, you can find it if you search the Slaver barracks in Paradise Falls (It is on a shelf). Next to it is a holotape labeled "Burn this Goddamn Jumpsuit." In it you hear an unnamed Slaver request that the jumpsuit be destroyed fearing that its former wearer may come back for revenge.

Appearance
The Vault 77 jumpsuit appears in the Penny Arcade Comic and in Fallout 3

Glitches / Easter Eggs
If you have Clover in your party, she gets mad when you "steal" this item, and goes rogue against you. On the PC version, if you use the "setownership 52392" console command, to just "take" the suit, instead of stealing it, Clover doesn't attack you. You can steal any other item from the room, and she doesn't seem to be bothered either, including the holotape.