Re: Which route should they go with Quicksilver's costume?
I'm not entirely sure what the rationale for the twins wearing costumes will be. For Iron Man, it's his suit of armor. For Thor, he's an Asgardian. For Captain America, it's his uniform as a soldier/agent. For Hulk...well duh. And for the Hawkeye and Black Widow, they're SHIELD agents. Scarlet Witch and Quicksilver will most likely be none of that.
2014 - Captain America: The Winter Soldier | The Amazing Spider-Man 2 | X-Men: Days of Future Past | Guardians of the Galaxy
2015 - The Avengers: Age of Ultron | The Fantastic Four | Ant-Man
2016 - Batman vs. Superman | X-Men: Apocalypse | The Amazing Spider-Man 3
TV - Arrow | The Flash | Gotham | Constantine | The Avenger | Hourman | iZOMBIE
TV - Agents of S.H.I.E.L.D. | Agent Carter | Daredevil | Luke Cage | Iron Fist | Jessica Jones | The Defenders