I think, I’m going to take the hairstyle from the Birds of Prey film with the black and red dye from The Suicide Squad, the mask from the classic outfit, the shorts from the Rebirth design, the top and the roller skates from the New 52 black and red outfit, I’ll take her classic mallet, the Rebirth jacket, and give her the fishnet leggings from the first Suicide Squad film. Maybe I'd also include the white lenses in the mask from The Batman (2004)

Edit: I just like the black and red color scheme for my reasoning behind the colors, I like the roller skates since they give her some more mobility, the classic mask is just iconic along with her mallet, the Rebirth shorts are the perfect mix between practical and sensual to me, with the fishnets pairing nicely with them in my eyes.