Popsugar Entertainment Halloween Mary-Kate and Ashley Olsen Halloween Costumes 14 Mary-Kate and Ashley Costume Ideas That Are Double the Trouble For Halloween October 28, 2017 by Kelsie Gibson View On One Page Photo 5 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Samantha and Emma, Switching Goals What to wear: This one is easy; all you need are soccer uniforms from opposing teams. How to act: Make people think you're someone else. Previous Next Start Slideshow HalloweenAshley OlsenMary-Kate OlsenNostalgiaHalloween CostumesPop Culture Halloween CostumesMoviesHalloween Costumes For Women