So I've had my Clark tartan kilt (Sport Kilt PV) since December (x-mas present).
It only now occurs to me that my kilt is asymmetric where from what I've seen Clark, and Clergy, tartans should be symmetric. I am not expecting authenticity from a Sport Kilt, I'm just curious. Why would they use an asymmetric pattern if in fact it should be symmetric? Not paying attention? Historically (I know, its a Sport Kilt, not a museum piece) are there examples of tartans that have both a symmetric and asymmetric pattern?

And a bonus question: Does anyone recognize this asymmetric tartan? And can you name it?
It is a ladies kilt made in Scotland and is made of wool. I picked it up at Savers for $5. It looks great on my wife but would like to know if the tartan has a name.