Yes, some expansion can be done. It is easier to reduce the kilt size than to expand it. What you need to look at is how big is your waist and how big it the kilt at the waist. Next, how big is the kilt at the hips vs. your hips. If it is only a few inches, it is possible, BUT it depends on a lot of things. The method of manufacture of the kilt differs from kilt make to kilt maker. Best to have a kilt maker discect the kilt to determine the best method.