Got quite a lot of questions about how I do my clothing line-ups lately.
If you're a little new to Photoshop and want to know how to clean up scanned artwork and what the heck I mean by 'set layers to multiply', I go over that stuff in the first half of this other tutorial
Hope this is helpful! PS. From left to right, Magda is wearing some kind of formal college robes, her battle garb, a nice dress, and a hack of Morgan's rags in which she is oddly badass.