Margot Robbie went to David Ayers expressing discomfort with her Harley Quinn outfit in Suicide Squad. He shot this down, arguing that they needed to show fidelity to Harley’s costume iconography.
Here are other characters where Ayer’s showed his fidelity to the comics iconography:
Captain Boomerang:
Slipknot:
Enchantress:
Tripping Through Gateways 
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