So the idea is that whatever faction you support you get a special armor unique to the courier. The armor can only gotten by completing a main quest for a faction like, The House always wins or things that go Boom...
My ideas were:
Mr.House: The Agressive Negotiator. Prewar Business wear with the same armor as the armor vault suit. + 10 pts to speech, barter and energy weapons and 2 pts to INT.

NCR: New Vegas Crusader armor: Same as the NCR elite ranger armor but revamped. longer trench coat, armor on legs as well and a darker shade of grey or black.. Basically the armor that appears on the front cover and the main menu. + 10 pts to guns, repair and medicine, and 2 pts to PER.

Legion: Assassin's robe. same color as NCR trooper armor, similar to Altair's robe, and legion elbem on the shoulder.

I have no idea what to do for yes man.

Anarchy Outfit. A King's Outfit with join pads and ammo belt. +10 Guns, Melee weapons and Unarmed as well +1 Luck.

I just want to wear the legate's armor.

Foam rubber ten gallon hat with a neon star and the phrase "This is all my fault."

No stats.

WWII paratrooper uniform. +1 Luck.

Only the lucky paratroopers lived.

This would have been a cool reward in addition to those given for the Legend of the Star quest.

Yes Man: Commander's Suit. Would be similiar to the design theory of the Centurion Armor. Would be like, NCR Elite Ranger top, with BoS Power Armor Leggings, a Caesar's Legion sash and cape, with Metal Armor Reinforced Mark 2 shoulderpads on one side.