It will depend on size of package and weight. I returned one from Alberta to Glasgow. Sent it back in the same box it came in and the charge was more than I paid to have it shipped it was lighter going back as I had several items that I kept. I tokk it back and repackaged into a smaller box and the price was better. I'm sure if you figure out the weight ( 2 8 yard 16oz kilts wpould weigh about 5 kg and then figure out what size and shape of box canada post or which ever courier company you want to use will be able to tell you. It also depends on how quickly it needs to get their and how much insurance you need/want to put on it. Good luck though it will be pricey I'm sure.
Freedom kilts or rkilts might beable to give you actual $ figure.