I have been lucky I suppose living where I do, this sort of thing is not a problem--------although, I do recall a very pretty young lady in the distant past who was none too impressed with the kilt, dammit. I digress, hurrumph!---------- Anyway, I read of of this problem of yours quite often here and it seems to me there is no quick fix. However, "knowing the enemy" so to speak, is a good start and work your strategy around that. Let her have a good look at the pictures on this website, there is a whole host of kilted attire options for her to see and think about, pipe bands are good for lightening the the atmosphere so let her see lots of kilts, so tactics of a "slowly, slowly, catchy monkey" kind would be my thoughts------------and hope! 
Good luck!
" Rules are for the guidance of wise men and the adherence of idle minds and minor tyrants". Field Marshal Lord Slim.
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