I suppose we are lucky in Scotland as we are never far from a kiltmaker and can go in the shop and get measured.
Some get you to kneel on the floor and measure from your belly button to the floor. Or ask for your belly button to centre of knee then automatically add 2 inches. I find both give too long a kilt. If it does not have a turned up hem (which is usual for a handmade) then it is difficult to alter. It looks like you may be able to raise it another inch which will look okay and maybe it is not as bad due to camera angle. Try a photo with your camera on a tripod or table about waist level and use the timer function.
Still a good looking kilt though.

Chris.