The master wardrobe 1 and 2 are house upgrades in Fallout: New Vegas. The upgrade provides an additional wardrobe in the master bedroom. The wardrobe is named "wardrobe 1" in the game, and is located on the left side of the master bedroom when you enter.
The player may purchase the upgrade for their Lucky 38 Presidential Suite anytime after obtaining the suite. It can be found in the master bedroom of the suite when purchased.