Though their are plenty iconic Barbie outfits I can see Margot Robbie rocking, the first Barbie Style doll looks like something she would actually wear. She even dressed in similar outfits before. :
Barbie Halloween Costume for Girls, Pink Tutu Dresses for Baby Girls – Belle Threads
See Margot Robbie and Ryan Gosling Dressed as Barbie and Ken | POPSUGAR Fashion
Fashion Fever Doll Outfit for Barbie Dolls in Mint Condition - Etsy
5 Barbie Outfit Ideas - Read This First
See Margot Robbie and Ryan Gosling Dressed as Barbie and Ken | POPSUGAR Fashion