This was just me really wanting to paint a redeemed (yet still alive) Darth Vader and Leia wearing a white getup like Padme wore in episode 2, just for fun.
The idea came from the Star Wars Infinites Return of the Jedi comic, in which Vader is actually saved by Luke and Leia and turns away from the dark side, joining the rebellion. In the last panel, he dons a completely white suit of his armor. I thought that was a neat idea, but the white armor was a bit much. I just wanted to give a little more "sith-turned-jedi" vibe from him, while I wanted to give Leia a little more "hot-in-a-tight-white-suit" vibe.