In the past, children's costuming has been... a little over the top? But now the rules are extremely restrictive. So goes the pendulum, I guess. Here's a pictorial example of what's allowed:
|Image from NDCA website|
She chose the middle one on the bottom row since the dress must be knee length. The only modification we're making is to not use any decorations at all. Another rule is that the costume must be made of ONE color. That's OK! Because I've got a bolt of neon/dayglow/electric pink/salmon knit jersey that looks a little like this:
The monitor of course doesn't do it justice. It's a bit more peachy and when light hits it, it GLOWS. Which is always a good thing.
What it won't look like? The "Her Name Was Lola" look from Strictly Ballroom: