After reading Barb T.'s book, I discovered that one of the Scottish made traditional wool kilts I bought several years ago had the fabric inside out. That is to say... the twill line runs from upper right to lower left.

The kilt was made by one of the large and well know weavers and kilt manufacturers in Scotland. Needless to say, I was a bit surprised. Both the fabric and the workmanship were quite good.. except that it was made inside out.

I'm having this kilt re-built so I'm not too concerned but I am curious.

Is there some structural significance to the direction of the twill line and the which side of the tartan faces out... or is it just an accepted standard that kiltmakers in general have decided to follow?

.