I found two ways to get around this: The i50/55 quest line armor is lore-wise a "restricted" style of armor - If you look around at the other Paladin NPCs, even the Sultansworn themselves, you rarely find anyone actually inside of it. Pieces, yes, but not the whole kit and kaboodle barring your big Roe friend from the questline.
However... the i90 armor you get from either trading in Antique item drops or from completing the 2.1+ main story (only after the Heavensward launch) is stated to be replica armor done in the style of the jobs as depicted in history. The other solution I found it to find a crafter to make you the Augmented Gallant Attire pieces (or just buying them from the Market Boards, but price and availability will fluctuate) and dying your armor to stand out. That's what I've had Warren do for... a long time, since basically those things got added to the game.
So technically, no, you can't wear that specific lore armor, but you absolutely can if you give yourself a reason to be wearing that style.
However... the i90 armor you get from either trading in Antique item drops or from completing the 2.1+ main story (only after the Heavensward launch) is stated to be replica armor done in the style of the jobs as depicted in history. The other solution I found it to find a crafter to make you the Augmented Gallant Attire pieces (or just buying them from the Market Boards, but price and availability will fluctuate) and dying your armor to stand out. That's what I've had Warren do for... a long time, since basically those things got added to the game.
So technically, no, you can't wear that specific lore armor, but you absolutely can if you give yourself a reason to be wearing that style.