@Anonomus I want to say yes? You'd have to finagle using Scaling and Modifiers like Shrinkwrap and Diffuse. The Draconian's base clothing also has blendshapes that can expand the entire mesh or select regions, so a little use of Blend from Shape in edit mode should do the trick.
The hard part is getting the pants to fit properly. Requires a lot of repositioning and forcing new positions every so often to fit them and praying that the weightpaint isn't screwed up beyond belief. It took me FOREVER to get the fundoshi from the swim suit set to fit on the Draconian, but it should be a little easier to use Draconian's clothes on Lunar Growl.
Mind, this is all with Blender. I've no idea in Unity.
