A kilt should fit snugly at the waist without being tight, sitting securely at the natural waist so it stays in place during movement. It should fasten comfortably using straps, buckles, or other closures, allowing slight adjustment without pulling or gapping. A proper fit will feel secure but not restrictive, with the waistband supporting the weight of the kilt evenly around the body. If it is too loose, the kilt may shift or sag, while a fit that is too tight can cause discomfort and strain on the fastenings.