Yeah I think short skirts and outfits that show midriff are slutty outfits. I'm not saying that children are, but when that much skin on a child is showing its an issue because there are people that do want to see that. I get that K-pop stars often dress slutty, but there was no need for that in a pg rated film.
Honestly parents need to do a better job at screening what their children watch and not just sit them infront of a full length movie because it's a new PG rated film on netflix. Parents are to blame for how their 7 year old dresses ultimately. But I think it would have been nice it the outfits used in the film were picked with the idea that young children would be emulating it.