In terms of costume design, first two Hunger Games movies never quite lived up to my expectations. It wasn't that the costumes were bad -- far from it -- but they seemed far too homogeneous. Given free rein to create the most outlandish designs imaginable, the Capitol fashjons were disappointingly conservative and homogeneous.
Mockingjay, Part 1 was another matter entirely. With no Hunger Games, Capitol makeovers, or District 12, the story focused on Panem's growing revolution, shown through the eyes of the propaganda war between the Capitol and District 13. Before the film even came out, YouTube propaganda clips began to illustrate the calculated nature of President Snow's public image.
Mockingjay flipped the cliché of dark and light, with the villainous President Snow surrounding himself with pure white to match his signature white roses. His brainwashed prisoners Peeta (dressed in an uncharacteristically stiff suit and a painful-looking white paper collar) and Johanna presented a united front, fitting in with Snow's clean, luxurious aesthetic. Meanwhile Katniss, daughter of coal miners, wears black body armour and fatigues.
In the earlier films, this kind of contrast was meant to highlight Katniss's salt-of-the-earth nature with Snow's obsessively controlled image, but this time it's more complex. Katniss may look more practical and less "styled" than Snow and his entourage, but that's because her District 13 stylists decided this was the best way to market her to the rebels. Her Mockingjay armor (in real life, modeled off a Japanese archery breastplate) was designed for her by Cinna, and continues the asymmetrical theme of previous outfits she wore to public appearances.