Armored Vault 101 Jumpsuit

The Armored Vault Suit is, as the name suggests, a version of the regular Vault-Tec Vault Suit modified to better protect its owner in combat.

Appearances
The armored version of the Vault Suit first appeared in the Fallout outro movie, but it wasn't a wearable in-game armor until Fallout 3, where it can be found in Craterside Supply, Moira's store in Megaton.

Trivia
Moira might be a reference to Bioshock, where Atlas' wife's name was Moira.