Something I love is Diana dramatically posing in front of Steve, announcing she’s ready for the Man’s World:
And he just looks up and goes, “NOICE”. Like, he doesn’t even question why would she wear something like that, he quickly picked these women are not’ playing around and whatever they wear works for them, so Diana’s new outfit must be lit, too.
Later, he asks her to get some new clothes when they get to the Man’s World but it’s not because he believes what she’s wearing is inapropiate, but because he knows the rest of the world will think and they need a low profile.
He never questions her choices of clothing or weaponery. The only time he did was before he saw how fierce the Amazons are, once he saw these women fight, he stood to fight with them, no questions asked, not a shitty comment after.
This is what makes him so unique in front of other male characters in superhero movies. Had someone else wrote and directed the movie, had he been the hero even, we would probably had to sit down and listen to him joke about her armor, question Diana or (yikes, yikes, yikes) see him checking her out in her “next to no clothes” armor.
But instead, he just nods and says “… cool”.