Usually, the whole costume should be one or two colours/shades only. Doing this just ensures that the costume does not distract from your superhero. When figuring out the colours of the costume, think of the powers your hero will have. For example, using a wide variety of colors for the costume isn't a good idea unless the powers of the hero are related to a rainbow.;
, Will it cover the whole body? Does it have a cape? Design the actual outfit first, before figuring out the logos. Once you have designed your costume, it gives you a blank slate to work with. Find a signature letter or symbol that relates to your superhero. For example, Spiderman has a spider and spider-web design on his costume, Batman has a bat logo, and Superman has an 'S' logo.
 What kind of mask will your hero wear? Will it cover the whole face, or only the eyes? The colour should go along with the characteristics of the hero. For example, Batman has a black mask because his name has the word bat in it, which is related to the dark. Alternatively, will your hero even have a mask at all? Not all superheroes have to have masks! Think of Superman, for example.
 Most superheroes carry a utility belt with them. You will have to decide how it looks and what it contains inside it. Consider having your superhero have a signature weapon that they carry with them in their utility belt (The most notable is Batman).
 A superhero could have gadgets built inside his costume as well.

Figure out the colour scheme of the costume.
Think up the design of the costume.
Decide on a mask.
Contemplate the utility belt.
Think up some extra gadgets.
Finished.
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