Well Suicide Squad still has more Oscars than La La Land for 10mins now!! Edit: those tweets beat me to it by seconds!!
Costume design is more than making actors look good especially if you're creating for iconic characters and trying to put a little twist on something that beloved. Suicide Squad sucked but I don't think it's insane that they won that category.
I should've went with Suicide Squad. I was going to, but I just kept thinking "there's no goddamn way they'll give it to Suicide Squad, Star Trek Beyond was a legitimately good film." But, nope.
*Nominated... and to be fair, Rick Baker is a legend in the make-up effects field. The Academy created the category basically to recognize his work in An American Werewolf in London.