What I did do was pass by the poster in one of the aisles with the kids and preteen costumes photos. I looked at the Aqua Fairy mentioned the article:
....Gabby did like the Aqua Fairy, a vampy get-up with a black ripped-up skirt, black fishnet tights and blue bustier that comes in medium, large and preteen. A medium fits a child of 8.
OK, so this exposes the shoulders and comes with fishnets. Perhaps this is why she opposed this. But as far as I could see no one at the store was buying this. And I could not hear anyone saying about anything "No, you can't have that," or "This is so inappropriate."
I did see two girls pointing to the racer costume below:
Now this is one the parents in that article would have opposed as well. Apparently there were no parents with these girls and I have no idea how old the girls were, though they looked to be between 16 and 21.