Where are you from? USA or EU? As Gotham said, if you have PS+ depending where you're from, we could use your savefile.
If you dont have PS+, we have to do the game from scratch, either in 1 hard playthrough, or in 2 playthroughs to get the armor and then get the trophy.
I have completed the game on hard without the armour before, Never died at all but it was hard, really hard, so Its great to have the armour.
I'd hate to charge a high price when you only need 1 trophy, but id also hate to charge a low price if I'd have to do the whole game anyway.