This armor was once worn by the security guards stationed inside the Sierra Madre Casino & Resort. It consists of a orange jumpsuit with reinforced knee pads, elbow pads, bracers, boots and a black stab vest with "Security" printed on the upper back worn over it.
A suit and helmet can be found in the Villa police station locker room. The suit can be found on one of the benches.
A suit can be found on a shelf next to a hard locked gun locker upstairs in the westernmost building in the Villa, slightly northwest of the police station.
2 suits and helmets can be found in a locker inside the Sierra Madre vault.
Notes
Both Sierra Madre armor and the reinforced variant are based on Vault 34 security armor, apart from the security helmets, and have "SECURITY" written on the back.
A faint "101" can be seen below the security text in the back of the armor.
Bugs
When a Stealth Boy is used in conjunction with this apparel, the imprint "SECURITY" on the back will appear as "101". This is because the armor's normal texture, while a separate file, is visually identical to that of Vault 101 security armor. [verified]