Wow! When ya don't know, ask a textile expert :-)

After carefully reading your explanation, it's clear to me that while my cloth seems to be a reasonably tight weave, it is a little scratchy....so it's probably not worsted.
It's all fine and dandy to me because it is still wool, and a "tartan" pattern which I find to be very attractive and "old timey" looking.
Let the truth be known that if I had found a cotton flannel bedsheet with the right length, colors and tartan pattern...I would have worn that as a great kilt until I found something better.

Thanks for your very knowledgeable explanation Riverkilt!