Captain Marvel (https://en.wikipedia.org/wiki/Carol_Danvers) is an Avenger and all around tough lady. She retired her awesome 60's bathing suit costume in favour of this military-esque getup, at the same time upgrading her codename from Ms. to Captain. She also got a pretty great haircut while she was at it, so it was a busy week for her.
Getting The Look
This is based on the original version of Carol Danver's Captain Marvel costume, rather than the current version that features slightly different details, a more muscular physique and a much shorter haircut.