Use the Nostradamus technique, all the kiltmakers on little bits of paper, then all the tartans, throw them all in the air and when one lands on the other you'll have the tartan and the kiltmaker!

Seriously, for me it's what I like and what is meaningful to me in a tartan.
For kiltmakers, that's harder, service, quality and price.
Generally too in business, I like to deal with people who make it easy to pay.