Trailer trash don't wear anything like designer clothes.
FAKE designer clothes. Cheap knock-off that they think look good. :)

Rose could, if you were uncharitable, be classed as a 'chav'. (Oooh boy, I still remember the fury when Cassandra called her that in 'New Earth'.)

But basically - poor, working class (possibly not actually 'working'), easily identified by clothing. Yet another subgroup in the English class system.

Might be racist, bigoted etc, but not necessarily.

And thanks for the story! :)