User blog comment:HazelQuill7445/Awesome fan art/@comment-24573226-20160620182448/@comment-4010415-20160620212511

No bras, strapless or otherwise:

And there aren't any good shots on the wiki that show Pyrrha's and Emerald's dance dresses were open in the back. Pyrrha's ponytail is in the way in all the screenshots.