"it is hard to buy that the female teacher would be after her for that" She told her to shop in the PLUS size department! How could that NOT be in reference to her clothes fitting tightly? lol And you excuse your assumptions as an "educated guess" after scolding others? The first line of the story said "told her during class", yet you were incensed anyone might assume it was done...during class in front of other students. The fact that she sent her to the office for a dress code violation, with nothing saying she'd been sent before, would serve to indicate that she did NOT have a history of wearing "revealing clothes". 

Teachers have a very different function than parents -  they prepare them academically for the world, no one, not even "those on the right" asks them to give fashion advice or comment on a student's body & this one seriously overstepped her bounds.  Even the district admits that. 

(cont)