3. Scarlet Witch's Costume
Throughout the course of Avengers: Age of Ultron, neither Quicksilver or the Scarlet Witch wear costumes as such. A lot of comic book fans have been worrying that Marvel would portray them as the kind of heroes who pretty much wear civvies all the time, and while we'll never get to see Quicksilver's suit, the movie does end with Scarlet Witch donning one. There's no classic headband, but it's a nice mixture of her classic and ultimate looks. Elizabeth Olsen has confirmed that she will return in Captain America: Civil War, so expect to see more of it there. Oh, and if you haven't seen the sequel yet and are desperate to know, it does indeed have just a hint of cleavage (like every comic costume she's ever worn).