Seriously, why would a prepubescent little girl need lingerie? Because that's the age where they start to really feel like they WANT to grow up. They're not kids but they're not teenagers either. So they want stuff the older girls have. Not all of them are like that but a good many of them are. So I imagine that's the reasoning behind this line.
And I'm not against a line of lingerie in theory but I'd have to see how it is executed. If we're just talking some pretty panties and training bras then it's okay. If we're going full out merry widows then I have an issue.
"All our dreams can come true -- if we have the courage to pursue them." -- Walt Disney
We must have different Gods. My God said "do to others what you would have them do to you". Your God seems to have said "My Way or the Highway".