From looking at the picture, it appears that you could easily move the two buckles on the right hip over a couple of inches and not adversely affect the look of the kilt -- look at how many pleats are there to the right of the buckles in the picture. Another two inches and you'd still have pleats all the way to the edge of the apron.

Just remember, what you do to one side, you have to do to the other. So if you move those buckles over by 2", you'll also have to move the leather strap on the inner apron out by 2" for the kilt to fit right. Since that doesn't show in your pictures, I can't tell you how easy that might be. If the leather strap is sewn in a few inches back from the apron edge, it's an easy job of moving it.

If it's already right on the edge of the apron -- well then you are talking about altering the kilt.

Aye,
Matt