I stumbled on something interesting at the Celtic Croft website. Generally speaking, the O'Callaghan tartan (ITI number 7299) is a special weave, so I had reconciled to the idea that getting a kilt made of it was a bit of a pipedream.

However, if you look at Irish woolen casual kilts on the Celtic Croft site there is a drop-down list of tartans entitled something like Irish crest tartans. I thought they would be the Marton Mills Irish county crest range, but no. It is a list of Irish family and clan names, and they list the O'Callaghan clan. The list of names is not all that long, but there are only about twenty recognised Irish clans and perhaps a dozen other Irish family tartans. I'm guessing they may be listing them all. I hope this is real and not some kind of mistake on their part.

Even then, it's $375 for a wool casual kilt, $410 in my size. They don't seem to have 8 yd Irish kilts. I may have to save up my pennies. I've been quoted far more elsewhere for a special weave casual kilt in mere PV, though, something like $700.