The only reason i can come up with is that Boromir's armor was disigned to travel. Perhaps this is his traveleing armor...? If you see in a TTT EV flashback when he is still in Gondor. He his heavily clad in silver armor.
Hope that helps...
-Cap.
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"Faithless is he who says farewell when the road darkens."
--J.R.R. Tolkien
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