Quote Originally Posted by Morris at Heathfield View Post
Is my major misdiagnosis that, after all these old tartan pieces I've seen, I'm still thinking of the way modern tartans are woven?
Yes

It occurred to me after I typed that last post that, if a plaid were woven single-width, then cut in half weftwise, and the two halves joined along one selvage, in order to preserve the tartan pattern, it wouldn't make sense to center the tartan pattern on the loom. Instead, one would want one selvage to occur on the edge of a check and the other to occur right in the middle of a check.
Absolutely right.

I know I've read all about it before (and seen photographs), but for some reason I got it confused with the way modern kilts are made from double-width fabric.
Not all modern kilts are made from double width cloth and any 'special' is still likely to be single width cloth.

I still think it's half a plaid or a philabeg. On closer inspection I see two or three red threads running across the top of the piece.
It is a single width piece of material which is in essance what you mean by 'a half plaid or philabeg'.

I'm assuming the thread at the "C" is where the fabric is hemmed, but the hem is not exactly visible from this side. Is the "IC" intended to be visible when the piece is worn? The way I visualize it, the initials would be on the left apron when worn.
I very much doubt that this was ever worn or intended to be worn.