View attachment 669004
Made this quick comparison. I used the 501st reference images for the original Vader suits, it was somewhat hard to find a good shot for the ROTS suit, so I just used that one. Really not sure why they chose to go with the larger cod piece, but I'm sure there's a logical reason as to why, it could be covering something, like stitching or a seam, in the crotch area of the suit or something. But asides from that I think the Rogue One suit looks pretty good. And I imagine he may have his cape pulled back a bit, on the shoulders, during the saber fight. I'd say they chose to place the inner robe under the chest plate, because it looks better.