She may have worn this as part of her overall costume, but this shirt has now become a casual fashion sensation. Here is the Daddy Lil Monster Harley Quinn Shirt. Margot Robbie wore this in Suicide Squad as Harleen Quinzel aka Harley Quinn.
The Suicide Squad Harley Quinn T-Shirt is made from 100% cotton. It has three-quarter sleeves that reach the elbow, which is also the exact length of the one worn by Harley. The logo is made on the front in the same font. Moreover, the colors of each sleeve give you a funky look. The length of the shirt reaches below the waist.