Quote Originally Posted by HeathBar
The thread count of the tartan may go something like 10K 5R 10K 5R 2Y 5R 10K 5R 10K. K=Black, R=Red, Y-yellow. The sett begins and ends in black. The yellow strip is in the middle. So a repeat might be the yellow stripe in one sett to the yellow stripe in the next sett, or the fist red stripe in one sett to the first red stripe in the next sett.

The size of the sett would be measured from the first black thread to the last black thread, in the above mentioned ,made-up, tartan. But you should get the same measurement if you measure from the middle of the yellow stripe to the middle of the next yellow stripe.
Just for fun, I plugged this one in at Tartans Authority's Design Studio.


What confuses me on this is why isn't there a swath of 20K where the pattern reverses itself? To see it better, I swapped out the last black for a violet.




Regards,
Rex in Cincinnati