There are some companys that are calling the tartan by it name but in fact changeing the colors to bypass the copyright laws.
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exsample # I bought a kilt in Acrylic from clans men knitwear and they called it -
Ancient Ferguson and in fact it was different -Organge was bright hunter Organge.
and the measurement of line to line was off .

So be carefull what you buy from whom. I was happy thinking I was getting my family kilt
But got a knock off