Slutty Halloween Costume of the Day: Old West Hooker Girl!

Clearly I am missing something.  Maybe I am not smart enough to figure out the vocabulary words being used to describe this Halloween costume.    The word tween means in someone who is between a child and a teenager, right?  So, I'm thinking like 10, 11 or 12 year-olds.  Am I totally off base with this?

Now, a saloon girl is an old west prostitute, isn't it?  So, the "Saloon Girl Junior Tween Costume" is by definition an outfit designed to make a girl look like an old-timey child prostitute.  If you happen to be in-between prison sentences and are in the market for something like this for the kid you keep locked in your attic, you can find one at Spirit Halloween supplies. FYI.