Teen fashion brands - all the same?

Aeropostale, American Eagle, Abercrombie...is it just me or do they all sound and look the same?
(I know, there are more, but still -- teenage styles all seem very similar, at least in the U.S. The only exception I can think of is Hot Topic.)
Brands are supposed to provide choice to the consumer, but it seems like teenagers have a very limited set of choices to work from.
An observation.