Quote - I really like the new WW look, actually.  And something else about it that I don't think anyone else pointed out is that the new look shown is probably more appealing to non-American audiences than the traditional star-spangled panties.  Not to mention far less wedgie inducing. :P

That is something you Americans are going to have to get used to: the film industry is appealing to wider audiences, especially the massive Chinese audience, so it isn't all going to be about you all the time.

Why do you think the main setting for Pacific Rim was Hong Kong, the Jaegars featured were American, Russian, Australian, and Chinese, and the last four pilots were American, British, Japanese, and Australian?

In the case of the Justice League film, assuming they stick relatively close to the current origin story, Diana/Wonder Woman isn't American and they've had to come up with some absurd explanations in the comics as to why she's wearing a clearly American-inspired costume. The eagle can get a pass since the eagle has been used in multiple cultures and it's not specifically a bald eagle, but the rest of the traditional costume?

The other thing to bear in mind is that what looks acceptable in the comics, or in animation, or even on low-rez TV in the 1970s (when, quite honestly, fashion was horrendous enough that the flag swimsuit looks good in comparison) doesn't necessarily translate well to high-def movies. You can see that in how Captain America's costume that he wore early in his film, which was closely modeled on the comic version, looks ridiculous compared to the other costumes he wore later in the film and the in the others he's appeared in.