Alright, it's not even a movie thing, it's the average person If the average person looks at a WW(or any female character) cover and see her in a bikini, they won't pick up the book. Why doesn't female comic characters sell books these days? Their over sexualized.
I thought they over sexualized them to sell books to horny male readers. In any case, Marvel grossly outsells DC and i dont see them covering their ladies. In any case, yes, i think some suits are bad and need to be redesigned (Huntress and WW included), but they shouldnt be enforcing a silly mandate indiscriminately. Sometimes skirts and panties are just fine. I mean Ivy is a meta, she doesnt need a suit when she's covered in leaves and choking you with her vines.
While tight leather is still very sexy, it's better than a bikini, I mean I can see a women rescuing people in a tight pants more than panties. Wonder Woman needs to be showcased a warrior, not a stripper.
Its a complex issue.
So first of all she is from a different world and thus she doesnt have to adhere to our standards. On the other hand, she's an imaginary character created for us, with some artist sitting in his office and deciding how to dress her, so our preconceptions do matter, so i guess she shouldnt look bad even if she is from another world. She's aimed at us is she not?
Therefore, i think she needs to look different, bright and whatever, but not bad. So on the one hand we have the classic suit that's iconic but has 1000 colours thrown on it, and 1000 different design patterns (red + gold eagle, blue + white stars, red + white lines = Its like a rainbow threw up on her), and on the other this new suit that is simpler and more modest but doesnt reflect her character.
I vaguely remember a story where some female villains were fighting some heroes until WW arrived. When she did, they all shut up and surrended with a "she's wonder woman" look on their faces. Its like some archangel, or saint, or Ghandi appeared in front of them and put them to shame with just a glare. Now do you see Diana having this stature in this pair of pants and bustier?