We use a combination of fasteners in our utility kilts, but then we are not traditional kilt makers. We use an adjustable snap button system at the waist on both the left and right side, giving the wearer the ability to adjust up or down one size each way. Buy a 40" waist, your kilt adjusts to a 38" or 42". We also include heavy duty belt loops on the waist. And we use the same fabric (#10-15 oz Duck Cloth or 10 oz Duck Cloth - dependent on customer's fabric weight preference) as that of the kilt to make the apron closures, with a double fork military style buckle. However, we deal only in modern utility kilts but at some point in the future would like to start working in traditional fare.