Sequels revealed even more, and Harley gained popularity and starring roles at DC (in an even skimpier costume).
You could even conclude that, thanks to her personality and appearance, Harley Quinn invites that kind of discussion, enthusiasm, and contradiction no matter where she goes.
But it was Hawley who pressed the original instinct, since Harley was “too sexy” for a standard outfit.
The costume in question was the torn prison singlet Harley sports while doing some inverted poses, revealed in the very first Suicide Squad sizzle trailer.