I don't know who did the costuming, but I love them for it. I mean, the first costume they put Katniss and Peeta in are those total villain costumes -- seriously, they've got the spiky black leather stuff and they are on fire! The book played it off as all dramatic and impressive, sure, but it wasn't till I saw that part of the film that I realized holy shit, they look fucking evil! I made a couple gifs and in every one Kat and Peeta look villain-tastic. It's like the Baroness meets The Rani or something. With fire, so a little Team Magma thrown in? And hell, a bit of Sauron l flair to boot. Check these outfits out. Watching these gifs out of context I get the vibe that these two are some sort of somewhat-confused villain team on a conquest tour or something. In a parade in the city they've conquered, I dunno. Katniss's hair looks really familiar too, but I can't think of where I've seen a similar style.
Kat kinda looks like the Master in that screen-banner thing.