So, no, you will not see Elizabeth Olsen donning anything close to the image above when she appears as Scarlet Witch in The Avengers: Age of Ultron next summer. She's already been filming, and tells Total Film Magazine (via IGN) that she's had to wear cloaks to hide her more grounded, modernized take on the classic look while on set:
I don't think Joss ever would have hired me, honestly, if he wanted me to wear those outfits; I am not a professional athlete and nor am I a model. Wearing those costumes wouldn't be fun for anyone who wasn't those things. He already had a different idea. It respects and involves the comic-book character but it's different, more rooted. It's for someone today.
Chris Evans, too, got new duds for Captain America: The Winter Soldier, his first solo film taking place in modern times, and director Joe Russo gives similar reasons for the costume change, telling SFX Magazine (via Coming Soon):
It was about a real world grounding approach to the character, in the spirit of Ed Brubaker's book, which is postmodern and deconstructionist and a grounded thriller. We wanted to put Cap in a space where he's a special forces operative for SHIELD who goes on missions around the world that are clandestine and sometimes require a certain level of anonymity or stealth. We wanted to use his Super Soldier outfit from the comic books as a way to represent, thematically, his place in the world of SHIELD and the difference between working for SHIELD and being Captain America. That's something that gets explored on a very concrete level in terms of what outfits are used in the film. We didn't feel like we were messing with the icon. People can say that they're fans of the books if they're only loyal to the '60s and '70s version of the character – well, then you're a fan of that version of the character, but if you've been reading the books till the current runs then this is a journey that the character goes on and it's a pretty explicit journey. We just felt like we were being faithful to the more recent issues of the books. The movie has a very thematic component in terms of the use of costumes. When you come to see the film I think you'll understand why we made the choice we made.