Prepare for the ultimate battle of the wasteland! This battle could never actually happen, unless time travel is involved or Mother ship cyro sleeps them, but let's just forget that.
Here are the battlers (is that even a word? )!

Vault dweller- as in canon (armoured vault 13 jumpsuit, red ryder BB gun, and 10mm pistol)

Chosen one- as in canon (armoured vault 13 jumpsuit, switchblade, and 14mm pistol)

Lone wanderer- as in canon (armored vault 101 jumpsuit, hunting rifle (I think, if I'm wrong tell me in comments!))

Courier 6- as in canon (what does he have in canon? I couldn't dig up anything so could you say in comments?)

Say how you think would win in this four way battle in comments and how it would unfold!

The http://fallout.wikia.com/wiki/Warrior

When you say canon in regards to clothing do you mean during the game or after? If its after, my best bet for FNV canon is the courier's duster.

Anyway, if the 4 of these guys met up I'd say the outcome is the Vault Dweller and the Chosen One teaming up and taking out the others... They are family, after all.