I've recently purchased three casual kilts from Burnett's and Struth, each to be made to the same measurements, yet each fits differently. Each of the kilts was basted differently, so I'm assuming three different makers worked on the kilts. Seems not all inches are quite the same.

One of my kilts is on it's way to Bonnie Heather, based on a good review of her alterations skills here, but I'm sure there are others. Over the years I've noted several kilt makers who specifically mention alterations and repairs on their web sites.