I don't think she ever did. :( But we all have our abandoned WIPs, right?
As much as I love fishnet stockings in real life and on others (and on my husband in my fantasies), I don't think they work on anyone who doesn't want to come off flaming. I think Roy's current costume has nice ties stretching across his chest? They have a slutty flavor that fits. Are you talking skintight fishnet sleeves? The bolero jacket would be perfect. Possibly a bare chest underneath, maybe with fishnet/mesh shirt. He must wear a black mask, ie Tuxedo Mask style!
...Just as an aside, in JLA: First Year? When Hal starts pestering Dinah about coming home to meet her mother? I immediately pictured Hal as a young boy with a original Black Canary poster on his door, dreaming of being her sidekick.