I just got this reply from an inquiry I sent about the tartan in question.

Dear Mr Seneca
Thanks for getting in touch with us. We do not offer the service of pipers plaid ordering online but we can make them.
Using the MacKenzie Seaforth regimental tartan the price of the plaid will be £470.00. I believe that the plaid can be either pleated to the line or to the sett and we would normally use 3.70mts (double width) of material. We would need to know your chest size and your height.
If you wish to proceed with an order please let us know your billing and delivery address and we can get in touch with you regarding payment.
Kind regards
Joanna