Yep, you're right, ever since Beast got blue fur he's been running around mostly naked from the waist up. I'd say he's iconic enough to count. But then again, like you said, blue fur. Likewise with Hulk.

As for normal-skinned superheroes who expose as much skin as Wonder Woman... Well, there's that one guy from the Legion of Superheroes who basically wears a space-corset and Speedos. But he's an extremely minor character, nowhere close to iconic. I can't even remember his name.