Last year with a vacation upcoming I set aside money for a casual kilt in PV for the trip and placed the order in plenty of time. Unfortunately, the tartan I wanted was unavailable from the mill after the order was placed. Although I have no affiliation, claim, right or perogative to wear it I chose (as a substitute) a clan tartan that was available and could meet my departure date. I do really like the tartan and wear it with the respect it is owed. Someone not as eminently diplomatic as Jock really castigated me for doing that and I felt bad about it. So I wrote the clan and asked for permission, they did not have an issue. (In fact I got 2 rather nice emails answered very quickly) So if it puts your mind at ease, that may be a route to follow.