Quote Originally Posted by JSFMACLJR View Post
Sure there is "THCD" equivalent, but those who are fans of modern kilt attire don't like it. We wear shirts, and hose, a tartan kilt, sporran, maybe a sweater if it's cool. We wear leather shoes on our feet, maybe rubber wellies if it's wet. Polo shirts work when it's warm.

It certainly is equivalent to "American standard casual dress."
Actually, what you describe sounds nice, but do you honestly think it is the equivalent of shorts, t-shirt, and sneakers? You also should not assume that wearers of modern kilt attire would not like that outfit, but they might still want something a little more casual as well. It isn't so much about wearing only one style as it is about wearing what seems appropriate for the time and place.