Vault Jumpsuit

The Vault Jumpsuit is a set of standard clothing worn by all inhabitants of Vault-Tec Vaults. The exact design of the suit is the same within a vault, but it seems that Vault-Tec might have purchased them from different subcontractors in different regions - e.g. the Vault Suits used in California Vaults, like Vault 13 or Vault 8 are skin-tight, while the ones from Vault 101, Vault 106 and Vault 112, located near Washington, DC, are more baggy.

While some says that the changing from Skin-tight to Baggy was because Vault-Tec bought different types of clothing to the different parts of the country, it could probably be because Bethesda made Fallout 3 and maybe in the "New" Fallout, all Vault-Tec Vault Jumpsuits were baggy, not because it was different in different parts of the country.

A variant of this suit, modified for extra protection, is called the Armored Vault Suit.

Appearances
Vault Jumpsuits appear in all Fallout games. However, in Fallout and Fallout 2 they are worn by the player character by default and only in Fallout 3 appear as actual in-game items.