Quote Originally Posted by TheOfficialBren View Post
Rock n Roll, James! I haven't ventured to untuck my shirt while kilted. I might try it once just to see how it goes.
If it's a t-shirt, then give'r. You're already informal, so you may as well untuck it and rock n roll. Besides, they tend to be short enough in the waist to still work with a kilt. For a button up shirt, I'd still tuck it in, especially if the kilt is worn at the natural waist.