User blog comment:InfinityWar22/Rumored New Netfix Series/@comment-27180456-20160522003543/@comment-25521424-20160522011356

They can't change the color of the costume of Moon Knight, that would be like changing the color of the costume of Batman.

Besides, the  fact that it's whit bright is another feature of the character, who doesn't want to hide in the shadow but want his enemies to see him miles away, to be scared of him.