You pretty much can't get any of these pieces anymore sadly

Chest piece is a ornament back in the 2nd season (Curse of Osiris)
Arms are the Star Crossed Fists back from the 5th season (Black Armory)
Legs are also from the 2nd season as the same with the chest piece (Curse of Osiris)
Class item is the Virtuous mark back from the 9th season (Season of Dawn)

If you also want the shader it's the Horizon Blush from season 12 (Season of the Hunt)

how do i get this armorrr

wow this is awesome it makes me want to make a new character