Quote Originally Posted by Morris at Heathfield View Post
I would imagine that a custom run of tartan could be had for the price of a custom run of tartan, no matter what thread count you specify. I don't think a tartan with a particular thread count would be any less difficult to set up than one with the same count doubled.
Generally that is the case. In the past I've been charged the same amount per yard even if ordering an off sett design to be used for a jined sett. That said, I have to do all the calculations but it's still amazing that there isn't a premium.