JB, I've noticed that certain characters never seem to have highlights on their black costumes (Havok, X-Men school uniforms), while others frequently have highlights and frequently don't (e.g. Spider-man both costumes) and still others who always seem to have highlights (e.g. Cyclops graduation costume, redesigned Fantastic Four uniforms). Do you have insight into how this has come to be? And do you have a personal rule of thumb that you practice when deciding when to include highlights? 

Edited to clarify that my reference to X-men School uniforms is a in response to recent trends.

I like seeing Nightcrawler's costume and the original X-Men uniforms done with flat blacks. Spider-Man's original threads look good with flat backs sometimes, too.

JB, was it your decision to make the blacks on Green Lantern's uniform flat on that holiday special you drew a while back?

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Can't go wrong following Gil Kane's model.