The Irish County Tartans are a commercial invention of Scot weavers to sell tartan. I own a kilt in the Donegal tartan, in Ireland I am/was viewed as a Scot visitor. Virtually no one in Donegal would recognize the tartan. Basically, the kilt screams TOURIST. If in a self colour, green screams louder tourist. Saffron is about the only kilt form that many Irish think of as being at all Irish. The kilt worn in the traditional Scottish manner will get compliments, and asked about the tartan, but not much more.
Slainte