It looks to me that this kilt is a woman's military kilt or a kilt altered in to a woman kilt by replacing the buckles and straps from right side to left side and by that changing the over and under apron. The kilt could have had an inside buckle replaced by welcro closing when the kilt was altered, therefor no trace of a button hole. The kilt has definetly been altered in some way since the buckles are attatched onto the under apron and not to the fell. That's way the apron don't align to the pleats and the the kilt is probably to tight for you originally. Check out the under apron, is it wider than the over apron? Is the tartan centered on the apron? If it is yes on both questions, this was probably the original over apron. This kilt is probably made for a man taller and slimmer than you or a woman with a kilt / skirt that was supposed to go below the knees.
Skål!