The introduction the game gives to faction armor specificly says that your actions while wearing faction armor still count against you, faction armor only brings your status with a faction to neutral temporarily, it doesn't allow you to negate infamy entirely and boone always causes members of the legion to attack on sight.So if you wear the armor but make boone wait you could more then likely do what you were trying do without gaining infamy but the second you lose the armor they will attack.

The introduction the game gives to faction armor specifically says that your actions while wearing faction armor still count against you. Faction armor only brings your status with a faction to neutral temporarily, it doesn't allow you to negate infamy entirely.

Boone always causes members of the Legion to attack on sight. So if you wear the armor but make Boone wait you could more then likely do what you were trying do without gaining infamy but the second you lose the armor, they will attack.