What you have created is essentially a "thread count" so any weaver in theory would be able to reproduce it.... however it is often a bit more complicated that, some tartan design programmes expect you to use their weavers.If you are sure that it is a design you like and that it works as a tartan, there are lots of complications in actually designing a tartan that works well from a kilt point of view, some existing tartans really don't work well from a kilt makers point of view, so you need to consider that as well