I have a question

So I’ve been thinking about this for a while, since Baltimore Comic Con to be exact.  I saw a young woman cosplaying as Storm from the X-Men.  But she was white.  It tool a second for me to go, oh she’s Storm.  I think most people are used to cosplayers playing characters that are white and the cosplayer is not white, but is it acceptable for it to go the other way?  My brother really likes Cyborg and would love to take on that costume as a challenge.  cyborg-teen-titans  But my brother is a ginger(pale white skin and bright red hair) and isn’t sure if that would be ok for him to make and then dress up as.  We were talking about this for a while and neither one of us could answer the question.  All we could come up with was we don’t know.  So, I’m posing the question to the universe, since it’s totally cool for a  character say to go from white to black (Nick Fury, Perry White) or for a cosplayer of color to cosplay a white character, such as Jay Justice, or Yaya Han, but is it ok for a white cosplayer to cosplay a black character such as Storm or Cyborg?