Just to throw a monkey wrench into this thread.

If you look at the fabrics used in Contemporary Kilts the Twill lines almost always run //// and there is no chance of reversing the fabric because there is no Twill line on the reverse side.

And if it was my site you stole the picture from, first, I want it back, there is now a big white empty space on my website. And secondly, I didn't care to properly align the Twill for the little photo, I was tired, I was in a hurry to take the photo, and I live in Canada now, even the toilet water runs down the wrong way up here 'cause heaven forbid we do ANYTHING like I used to do when I was down among you Amuricans.