Call it a kilt or just a manskirt. I don't really care. So far as I know, there has never been a single, comprehensive set of rules to determine exactly what is or isn't a kilt. What we have is more of a vague set of guidelines.

As far as I'm concerned if it's a MUG, pleated and/or has overlapping aprons, and the maker calls it a kilt, that's good enough for me.

I have also noticed that the term kilt is being used more and more as a general term for manskirts. Not too long ago I was watching a special on the discovery channel called the true story of noah's ark, which concluded with their dramatization of a Mesopotamian flood and mentioned that this noah wouldn't have worn the familiar robes, but actually would have worn a kilt. And I found this odd, because the actor on the screen was wearing a long skirt made out of overlapping leaves.

I think it's just easier for those who are unfamiliar with the term "MUG" to call any manskirt a kilt.