I'll admit that I'm not what you'd call a prolific cosplayer, but that never stops me from coming up with new ideas! i may never actually build some of those concepts, but I can still share my ideas.
This is a recent idea I came up with. After seeing several cosplayers, like Vivid Vivka and VeraBambi, create impressive female Joker costumes I thought it would be fun to design a male Harley to go along with them! The story I came up with for this version of Harley was that he was an orderly at Arkham, rather than a psychologist. He was that one who had to step in and physically restrian inmates when they got out of hand. That's how he met "Ms J." Now he acts as her hype-man, making sure the entire world knows just how special his Crown Princess of Crime really is... and he's ready to deal with anyone who says otherwise!
Visually, I wanted to have multipe throwbacks to Arkham in the design. The ring-master-style coat is made from a modified straight jacket from the asylum, hence the leather straps. Under the coat is what's left of his scrubs, stained with dirt and blood from the other inmates. I also chose to do away with the domino mask and simply paint the diamond pattern over the eyes. I also took a page from the New 52 and dyed the hair half red and half black.