Batman: svelte or bulky body shape?

[Gotham citizen]

Yeah comic book colors were originally very limited and the blue on Batman's costume and Superman's hair, etc. was originally intended to represent light reflecting on a black surface, not literately blue hair and a blue Batsuit, that became traditional, but it looked like they had blue hair and it looked like a blue Batsuit.
[…]

I think the master on the technique of the use of the blue was John Buscema: he inked almost all the black object, leaving only few white zones, so no one could misunderstood it was an actually black surface with some reflection of light. But John Buscema is John Buscema and there is a reason he was nicknamed the "Michelangelo of the comics".

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