Yup. The suit was actually black in the beginning with blue highlights:
The same way Superman's black hair was constantly shown via blue highlights:
The thing is that the suit always looked so blue that it sticks whereas we all know Superman's hair is black.
It's odd how comics will highlight black with blue to show contours when the contours on any black object are actually gray or white, unless it is reflecting another thing that is blue near it.
I realize that the sky is blue, but since Stealth paint would be flat, the armor would not reflect, and hence the highlights would still be gray. Using blue highlights on black just doesn't make sense.
I did know a guy with black hair who had it dyed with a special blue metallic so that it DID look like Superman's hair. His hair looked black until it was in the sunlight and then you could see blue highlights. It was interesting and it reminded me and him of how Superman's hair looked.
That said, the first Stealth armor figure I know of was the Marvel Legends one, which was an ultramarine blue, which is much darker than the blue on this figure, and I think that color would look more appropriate. Again, a blue object is harder to see against a blue background. Similarly, you would not paint a car black to make it stealthy either. You would paint it a flat, light to medium bluish gray, in order to strike a compromise between the color of the asphalt and the sky. I would also prefer the look of a blue Stealth Armor. Perhaps a blued steel color, at the darkest. Somewhere between ultramarine blue and midnight blue would be what I would prefer, but nothing lighter than sapphire blue, which this blue on this figure is lighter than. That said, even if the color remains the same on the production one, I will get one.