Hahaha... The title is named "Ninja Uniforms" for lack of better titling. It's actually the second uniform test for the same four girls: Ally, Natalie, Jenna and Ruby. This is the outfits they wear on their "night" jobs. And that's all the information I can give for now.
Done in Adobe Photoshop CS2 while it was outlined in 0.7 2HB mechanical pencil. The individual pictures of all four girls can be found in my deviations as well.