I'm not sure if the kids (or parents) are allowed to pick their own clothes and hair styles. My guess is that each kid is sent to wardrobe and gets their hair, and makeup done as well.
I just wish they would dress them more like kids. Danielle Taylor and Jordan always look fantastic! They dress Chantel, Lucy and Katelyn waaay too mature (I know they're older, but still, that dress Katelyn was wearing the other night was like she was going to a business cocktail party). And poor little Tori...she looked so cute in past shows and then on her last solo performance night I don't even know what was going on there. That outfit was dreadful on her...and her hair style...lordy!
They're kids...just let their natural beauty and youth shine through.