I am not completely familiar with the Air Force regs, so I would say to look there for your definitive answer.

However, based on what I know from Army regs, there is no provision for wearing the kilt with the uniform, except when specifically allowed for things like official pipe bands.

So, officially, it shouldn't be worn that way.

Now, that being said, probably no one would say anything, or even know any better, but if you want to be "correct" I believe that is the answer.