I agree that it is awful. I'm not saying that I think girls should be dressed in velvet 'party dresses' with ribbon around the waist until they are 15, but all the tarty stuff just has to go.
I've got no problems with girls of whatever age wearing short-ish skirts with boots, so long as the boots aren't 'f*ck me boots' (you know the sort, black, knee high, thin & high heel...) and the skirt isn't around their arse. For instance I saw a little girl of around 5 in Birmingham city centre dressed in a kilt type short skirt (pleated), with woolly tights and mid calf boots (flat) and she looked perfectly cute. Not in the least bit provocative or tarty, she looked like a little girl dressed for autumn/winter.
I think the thing I object to most is the slogan stuff, mainly things like 'Hands Off!' splayed across the chest of a crop top or '100% babe' etc etc. Those things are tacky enough on adults (to say the least), but on kids it's just abhorrent.