I must say I find your idea intriguing. The room is wonderful, so white, bright and light. Taking the leap to asking if you can use it and then having a trial shoot is excellent. Your models will look good dressed both ways, and I would try both costumes if you have time. In my limited experience the one most important thing you can do to improve your shots is get your flash off the camera and onto a light stand, using a remote trigger. This will give you a way to decrease the shadows without the complications of the LED continuous lights. Also it will help a lot if you can use a tripod for your camera. But my take on your whole project is that it will ultimately get you some excellent photos, no matter how you decide to proceed. I'm looking forward to seeing the results.