Grant is right about moving the right buckles, and the part about the left strap sounds right ... but looking at the pleats, my advice would be to contact one of the kiltmakers here (Matt Newsome, Barb, Rocky, MacHummel) or a local kiltmaker (if you can find one), and see if the horizontal length can be shortened by modifying the deep pleat or adding a hidden pleat towards the underapron. They should also be able advise on possibly shortening the kilt slightly - maybe what's below the last yellow stripe in the overcheck.
And to my eye, the width of the overapron looks like it could be left alone, or narrowed slightly. (Wouldn't it be nice if everything but the length could be fixed by narrowing the aprons?)

But I'm just a talented amateur. Like Grant said, get in touch with one of our professionals.