Check out a really cool video below with the head of Ironhead Studios, Jose Fernandez, who has worked on costume designs for a slew of movies.
Fernandez is actually the costume designer for Batman Vs. Superman and notes he's pretty ticked WB didn't give him credit for his Batman, Superman and Wonder Woman creations.
Ironhead also created designs for Tron, Captain America and Black Panther.
Fernandez also lets it be known that he worked on the costume designs for X-Men: Apocalypse, but was out bid on the design for Oscar Isaac's Apocalypse. Similar to just about everybody, when the first look at Apocalypse was released, he was pretty much underwhelmed -- so he decided to create a sculpt of his version of Apocalypse anyway, which we see is spot on to the comic book look. What could have been...
Images below as well.