Gladiator armor

Description
This armor is automatically equipped when fighting in the arena at The Fort. It is identical to leather armor.

Although you cannot keep it after fights (unconfirmed), it is the best light armor in the game, with a 19 DT

It should also be noted that getting the armor out of the Fort will result in a DT of 12 and no agility bonus. It will also be considered a quest item and will not be removable from your inventory, but since it is a quest item, the 15 WG will not be added to your overall WG, as all quest items are.

Location
Located at The Fort while fighting Benny in the arena.

You also wear it if you choose to fight in the arena in order to gain fame with Caesar's Legion.

Appearances
Gladiator Armor is only found in Fallout:New Vegas.