Hi fellow Midna-cosplayer!
I'm doing a Midna cosplay as well. A good tip for you to is to spraypaint the body suit when you're wearing it. You may want to ask someone else to do it for you, since you'll need to cover parts of the body suit with a towel so it doesn't get black dust on it.
Also, painters tape should be a really good thing put on the suit, to create the line between the black and white color.
I hope this was helpful!