Superheroes change back to their classic looks all the time. Jean Grey is wearing her old green dress from the 60's and Cap is back in his original duds (pirate boots and all!) in the very same issue. I don't think it would arouse much suspicion, usually in superhero comics it's the opposite. (A NEW costume means either an impostor has taken on your identity or that you have adopted a new dark and violent worldview.)
Maybe the writer and editors at Marvel think they bonded during "AvX?" Or perhaps she just finds it hypocritical to give second (and third, fourth...) chances to all the other villains on Krakoa and NOT Wanda?
"The White Queen welcomes you, TO DIE!"
I would rather have her tortured in Chthon's dimension lol, at least she is theoratically allowed to beat the shit out of him afterwards without bunch of fans demanding her to forgive dear creator Chthon lol.
Also the thing is, more often than not, Wanda cannot be the main character when Magneto is around, heck she cannot even have a consistant characterization when that happens. Even if we ignore him being a shitty dad, Magneto can be often detrimental to her on a narrative level by simply being her more popular dad.
I honestly didn't know Wanda was in the current Avengers title now. (I don't like what Jason Aaron has done with the book so I dropped it awhile ago.) Outside of the cameo in Strange Academy and Darkhold being a hold over from last year I had no idea that the new costume was appearing so much in recent Avengers material.
I seem to remember reading a comic where Hawkeye was rocking his old suit and was asked why he wasn't in the new outfit and the answer was something mundane like it "was in the wash." And I think Spidey has put on his black costume once or twice when his red and blues were shredded. No reason Wanda couldn't have just left the new outfit at the dry cleaners or something.
"The White Queen welcomes you, TO DIE!"
She was in Avengers Empyre at the same time as she was in X-Men Empyre. But two different looking Wandas. To which I joked the other was an imposter. But it could have been a clone for all I know with this current story.
The classic she hasn't worn really since before Uncanny Avengers. And she had two different costumes for UA. The coat one and the one with the weird shoulders.
Love is for souls, not bodies.
I am a bit cynical in terms of them playing it that close and lets face it the only time she would have called him daddy was a period of a few weeks between House of M and Avengers 503. If they wanted to go with a feelings not blood makes us related story they would have to play it that close.
So, I don't know for sure where they are going yet.