And then, my daughters will doubtless want kilted skirts made from it as well (my eldest is becoming extremely involved in Irish and Highland dancing
A highland dancer does not wear a kilted skirt. The dress code that guides the dancers of the SOBHD (which is all of North America) specifically states kilts. There is some leeway granted of course for pre-premiers and the young and tiny. But, Barb is quite correct, a kilt made from tartan over 13oz can be very heavy to dance in.

Btw, your design is quite eyecatching and could prove to be quite attractive to dancers.