Comic book artists don’t often put much thought into what street clothes look like, so the answer to this ends up being, ‘well, whatever.’
Or, more specifically, well, whatever reflects the period. I know nothing about the fashion of any era, and anyone hoping I’ll comment on it knowingly is outta luck. I do, however, know all about Wanda’s history, so, in lieu of summing up her style, which she doesn’t really have, I’m going to go through various periods and post some examples.
This is a long post. It’s five decades of history and no quick answers.
from Avengers Vol. 1 #16 & 18
In the 60′s, Wanda tends towards “furry” and “fancy.” She’s a celebrity who likes going to the theater. There are luxurious fur coats, but there’s also whatever that matching pink vest/pant combo above is (with a white undershirt?). Mainly, she wears generic, nondescript shirt-and-skirt outfits or dresses. The color palette isn’t too distinct either. Lots of pink, orange, red, brown, white. She’s not walking around in red red red all day, but she’s not wearing a whole range that includes blue or green either.
Before the world knew it had heroes among it. It had SHIELD University. Since it’s founding, SU has been opening it’s doors to weird science accidents, mutants, agents in training and the brilliant minds of the world. The world is changing and SHIELD is leading the pack with their advanced technology and services catering to all its students.