Spartan Tartan,

With the tartan you linked to, it appears that there are a number of lines which are are only one or two threads wide, so it would likely lend itself well to increasing the size without making the sett appear too bulky. In other words, it has the room to grow.

I imagine you could copy it on one of the free tartan design programs available at Scotweb or others and see what you come up with.

Another thought is that if you are committed to the tartan you will accept it for what it is and wear it with pride. Not that you shouldn't scale it up, just that once you have it on you will likely forget about the thread count. There are a number of clans who only have one or two tartans for instance, I am sure folks of those clans don't spend a lot of time worrying about their thread count! It's their clan tartan and they wear it with pride, and that's that!

Best of luck!